Merge pull request #65077 from etcwilde/ewilde/5.9/metadata-cleanup

[🍒 5.9] Replace mismatched `delete` with `swift_cxx_deleteObject`

Author: tbkka

stdlib/public/runtime/Metadata.cpp

@@ -1063,7 +1063,7 @@ namespace {
 
         // Otherwise, use the new entry and destroy the one we allocated.
         assert(existingEntry && "spurious failure of strong compare-exchange?");
-        delete allocatedEntry;
+        swift_cxx_deleteObject(allocatedEntry);
       }
 
       return { static_cast<SingletonMetadataCacheEntry*>(existingEntry), false };