Fix a tail padding bug in the record layout builder code. The bug was found by an existing test.

llvm-svn: 77189
diff --git a/clang/lib/CodeGen/CGRecordLayoutBuilder.h b/clang/lib/CodeGen/CGRecordLayoutBuilder.h
index b938785..f236881 100644
--- a/clang/lib/CodeGen/CGRecordLayoutBuilder.h
+++ b/clang/lib/CodeGen/CGRecordLayoutBuilder.h
@@ -111,6 +111,10 @@
   /// AppendBytes - Append a given number of bytes to the record.
   void AppendBytes(uint64_t NumBytes);
 
+  /// AppendTailPadding - Append enough tail padding so that the type will have
+  /// the passed size.
+  void AppendTailPadding(uint64_t RecordSize);
+  
   /// getNextFieldOffsetInBytes - returns where the next field offset is.
   uint64_t getNextFieldOffsetInBytes() const;