Merge pull request #74208 from apple/egorzhdan/frt-duplicate-metadata-accessor

[cxx-interop][IRGen] Emit type metadata accessors correctly

Author: egorzhdan

lib/IRGen/MetadataRequest.cpp

@@ -1102,9 +1102,6 @@ MetadataAccessStrategy irgen::getTypeMetadataAccessStrategy(CanType type) {
       assert(type->hasUnboundGenericType());
     }
 
-    if (type->isForeignReferenceType())
-      return MetadataAccessStrategy::PublicUniqueAccessor;
-
     if (requiresForeignTypeMetadata(nominal))
       return MetadataAccessStrategy::ForeignAccessor;
 

test/Interop/Cxx/foreign-reference/multiple-protocol-conformances.swift

@@ -0,0 +1,17 @@
+// RUN: %empty-directory(%t)
+// RUN: split-file %s %t
+// RUN: %target-build-swift -I %S/Inputs %t/main.swift %t/second.swift -cxx-interoperability-mode=default -Xfrontend -disable-availability-checking
+
+// XFAIL: OS=windows-msvc
+
+//--- main.swift
+import ReferenceCounted
+
+protocol P1 {}
+extension GlobalCount : P1 {}
+
+//--- second.swift
+import ReferenceCounted
+
+protocol P2 {}
+extension GlobalCount : P2 {}