Merge pull request #38388 from nate-chandler/cherrypick/rdar80485869/release/5.5

[5.5] [TBDGen] Use default kind for AFPAST SILDeclRef.

Author: nate-chandler

lib/IRGen/Linking.cpp

@@ -462,9 +462,7 @@ std::string LinkEntity::mangleAsString() const {
 
   case Kind::AsyncFunctionPointerAST: {
     std::string Result;
-    Result =
-        SILDeclRef(const_cast<ValueDecl *>(getDecl()), SILDeclRef::Kind::Func)
-            .mangle();
+    Result = SILDeclRef(const_cast<ValueDecl *>(getDecl())).mangle();
     Result.append("Tu");
     return Result;
   }

test/TBD/rdar80485869.swift

@@ -0,0 +1,7 @@
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend %s -emit-module-path %t/module -emit-tbd -enable-testing
+
+public actor Tom {
+    init() async {
+    }
+}