alias should care complemented flag

`me->defined_class` should be 0 for method entries of
Modules. The current implementation violates this condition
when the aliased object was complemented cme.

This patch checks this condition
and fix ruby#11965 (comment)

Author: ko1

test/ruby/test_alias.rb

@@ -292,4 +292,40 @@ class A
       end
     end;
   end
+
+  def test_alias_complemented_method
+    assert_in_out_err(%w[-w], "#{<<~"begin;"}\n#{<<~'end;'}")
+    begin;
+      module M
+        def foo = 1
+        self.extend M
+      end
+
+      3.times{|i|
+        module M
+          alias foo2 foo
+          remove_method :foo
+          def foo = 2
+        ensure
+          remove_method :foo
+          alias foo foo2
+          remove_method :foo2
+        end
+
+        M.foo
+
+        original_foo = M.method(:foo)
+
+        M.class_eval do
+          remove_method :foo
+          def foo = 3
+        end
+
+        M.class_eval do
+          remove_method :foo
+          define_method :foo, original_foo
+        end
+      }
+    end;
+  end
 end

vm_method.c

@@ -2333,7 +2333,11 @@ rb_alias(VALUE klass, ID alias_name, ID original_name)
 
         alias_me = method_entry_set(target_klass, alias_name, orig_me, visi, orig_me->owner);
         RB_OBJ_WRITE(alias_me, &alias_me->owner, target_klass);
-        RB_OBJ_WRITE(alias_me, &alias_me->defined_class, orig_me->defined_class);
+
+        // defiend_class should not copy from complemented me (cme)
+        if (!METHOD_ENTRY_COMPLEMENTED(orig_me)) {
+            RB_OBJ_WRITE(alias_me, &alias_me->defined_class, orig_me->defined_class);
+        }
     }
 }