Remove some dead stuff (#46494)

* Remove some dead stuff

* Remove unnecessary test

* Remove FCall alias

Author: danmoseley

src/libraries/System.DirectoryServices.Protocols/src/System/DirectoryServices/Protocols/ldap/LdapSessionOptions.cs

@@ -1093,11 +1093,7 @@ private static bool AddLdapHandleRef(LdapConnection ldapConnection)
             bool success = false;
             if (ldapConnection != null && ldapConnection._ldapHandle != null && !ldapConnection._ldapHandle.IsInvalid)
             {
-                try { }
-                finally
-                {
-                    ldapConnection._ldapHandle.DangerousAddRef(ref success);
-                }
+                ldapConnection._ldapHandle.DangerousAddRef(ref success);
             }
 
             return success;
@@ -1107,11 +1103,7 @@ private static void ReleaseLdapHandleRef(LdapConnection ldapConnection)
         {
             if (ldapConnection != null && ldapConnection._ldapHandle != null && !ldapConnection._ldapHandle.IsInvalid)
             {
-                try { }
-                finally
-                {
-                    ldapConnection._ldapHandle.DangerousRelease();
-                }
+                ldapConnection._ldapHandle.DangerousRelease();
             }
         }
     }

src/libraries/System.Private.CoreLib/src/System/Security/SecurityCriticalAttribute.cs

@@ -3,9 +3,7 @@
 
 namespace System.Security
 {
-    // SecurityCriticalAttribute
-    //  Indicates that the decorated code or assembly performs security critical operations (e.g. Assert, "unsafe", LinkDemand, etc.)
-    //  The attribute can be placed on most targets, except on arguments/return values.
+    // Has no effect in .NET Core
     [AttributeUsage(AttributeTargets.Assembly |
                     AttributeTargets.Class |
                     AttributeTargets.Struct |

src/libraries/System.Private.CoreLib/src/System/Security/SecurityRulesAttribute.cs

@@ -3,13 +3,7 @@
 
 namespace System.Security
 {
-    // SecurityRulesAttribute
-    //
-    // Indicates which set of security rules an assembly was authored against, and therefore which set of
-    // rules the runtime should enforce on the assembly.  For instance, an assembly marked with
-    // [SecurityRules(SecurityRuleSet.Level1)] will follow the v2.0 transparency rules, where transparent code
-    // can call a LinkDemand by converting it to a full demand, public critical methods are implicitly
-    // treat as safe, and the remainder of the v2.0 rules apply.
+    // Has no effect in .NET Core
     [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = false)]
     public sealed class SecurityRulesAttribute : Attribute
     {

src/libraries/System.Private.CoreLib/src/System/Security/SecuritySafeCriticalAttribute.cs

@@ -3,15 +3,7 @@
 
 namespace System.Security
 {
-    // SecuritySafeCriticalAttribute:
-    // Indicates that the code may contain violations to the security critical rules (e.g. transitions from
-    //      critical to non-public transparent, transparent to non-public critical, etc.), has been audited for
-    //      security concerns and is considered security clean. Also indicates that the code is considered SecurityCritical.
-    // The effect of this attribute is as if the code was marked [SecurityCritical][SecurityTreatAsSafe].
-    // At assembly-scope, all rule checks will be suppressed within the assembly and for calls made against the assembly.
-    // At type-scope, all rule checks will be suppressed for members within the type and for calls made against the type.
-    // At member level (e.g. field and method) the code will be treated as public - i.e. no rule checks for the members.
-
+    // Has no effect in .NET Core
     [AttributeUsage(AttributeTargets.Class |
                     AttributeTargets.Struct |
                     AttributeTargets.Enum |

src/libraries/System.Private.CoreLib/src/System/Security/SecurityTransparentAttribute.cs

@@ -3,12 +3,7 @@
 
 namespace System.Security
 {
-    // SecurityTransparentAttribute:
-    // Indicates the assembly contains only transparent code.
-    // Security critical actions will be restricted or converted into less critical actions. For example,
-    // Assert will be restricted, SuppressUnmanagedCode, LinkDemand, unsafe, and unverifiable code will be converted
-    // into Full-Demands.
-
+    // Has no effect in .NET Core
     [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = false, Inherited = false)]
     public sealed class SecurityTransparentAttribute : Attribute
     {

src/libraries/System.Private.CoreLib/src/System/Security/SecurityTreatAsSafeAttribute.cs

@@ -3,14 +3,7 @@
 
 namespace System.Security
 {
-    // SecurityTreatAsSafeAttribute:
-    // Indicates that the code may contain violations to the security critical rules (e.g. transitions from
-    //      critical to non-public transparent, transparent to non-public critical, etc.), has been audited for
-    //      security concerns and is considered security clean.
-    // At assembly-scope, all rule checks will be suppressed within the assembly and for calls made against the assembly.
-    // At type-scope, all rule checks will be suppressed for members within the type and for calls made against the type.
-    // At member level (e.g. field and method) the code will be treated as public - i.e. no rule checks for the members.
-
+    // Has no effect in .NET Core
     [AttributeUsage(AttributeTargets.Assembly |
                     AttributeTargets.Class |
                     AttributeTargets.Struct |

src/libraries/System.Private.CoreLib/src/System/Security/SuppressUnmanagedCodeSecurityAttribute.cs

@@ -3,8 +3,7 @@
 
 namespace System.Security
 {
-    // SuppressUnmanagedCodeSecurityAttribute:
-    //  This attribute has no functional impact in CoreCLR.
+    // Has no effect in .NET Core
     [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class | AttributeTargets.Interface | AttributeTargets.Delegate, AllowMultiple = true, Inherited = false)]
     public sealed class SuppressUnmanagedCodeSecurityAttribute : Attribute
     {

src/libraries/System.Private.CoreLib/src/System/Threading/SemaphoreSlim.cs

@@ -341,17 +341,8 @@ public bool Wait(int millisecondsTimeout, CancellationToken cancellationToken)
                         }
                     }
                 }
-                // entering the lock and incrementing waiters must not suffer a thread-abort, else we cannot
-                // clean up m_waitCount correctly, which may lead to deadlock due to non-woken waiters.
-                try { }
-                finally
-                {
-                    Monitor.Enter(m_lockObjAndDisposed, ref lockTaken);
-                    if (lockTaken)
-                    {
-                        m_waitCount++;
-                    }
-                }
+                Monitor.Enter(m_lockObjAndDisposed, ref lockTaken);
+                m_waitCount++;
 
                 // If there are any async waiters, for fairness we'll get in line behind
                 // then by translating our synchronous wait into an asynchronous one that we

src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/ProducerConsumerQueues.cs

@@ -181,14 +181,8 @@ private void EnqueueSlow(T item, ref Segment segment)
             newSegment.m_state.m_last = 1;
             newSegment.m_state.m_lastCopy = 1;
 
-            try { }
-            finally
-            {
-                // Finally block to protect against corruption due to a thread abort
-                // between setting m_next and setting m_tail.
-                Volatile.Write(ref m_tail.m_next, newSegment); // ensure segment not published until item is fully stored
-                m_tail = newSegment;
-            }
+            Volatile.Write(ref m_tail.m_next, newSegment); // ensure segment not published until item is fully stored
+            m_tail = newSegment;
         }
 
         /// <summary>Attempts to dequeue an item from the queue.</summary>

src/libraries/System.Private.CoreLib/src/System/Threading/ThreadLocal.cs

@@ -122,17 +122,12 @@ private void Initialize(Func<T>? valueFactory, bool trackAllValues)
             _valueFactory = valueFactory;
             _trackAllValues = trackAllValues;
 
-            // Assign the ID and mark the instance as initialized. To avoid leaking IDs, we assign the ID and set _initialized
-            // in a finally block, to avoid a thread abort in between the two statements.
-            try { }
-            finally
-            {
-                _idComplement = ~s_idManager.GetId();
+            // Assign the ID and mark the instance as initialized.
+             _idComplement = ~s_idManager.GetId();
 
-                // As the last step, mark the instance as fully initialized. (Otherwise, if _initialized=false, we know that an exception
-                // occurred in the constructor.)
-                _initialized = true;
-            }
+            // As the last step, mark the instance as fully initialized. (Otherwise, if _initialized=false, we know that an exception
+            // occurred in the constructor.)
+            _initialized = true;
         }
 
         /// <summary>