Tell MirUsedCollector that the pointer alignment checks calls its panic symbol

Author: saethlin

compiler/rustc_monomorphize/src/collector.rs

@@ -844,6 +844,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirUsedCollector<'a, 'tcx> {
             mir::TerminatorKind::Assert { ref msg, .. } => {
                 let lang_item = match &**msg {
                     mir::AssertKind::BoundsCheck { .. } => LangItem::PanicBoundsCheck,
+                    mir::AssertKind::MisalignedPointerDereference { .. } => LangItem::PanicMisalignedPointerDereference,
                     _ => LangItem::Panic,
                 };
                 push_mono_lang_item(self, lang_item);