Forgot this file in my last commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73578 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/DerivedTypes.h

@@ -50,6 +50,10 @@ protected:
   ///
   void dropAllTypeUses();
 
+  /// unlockedRefineAbstractTypeTo - Internal version of refineAbstractTypeTo
+  /// that performs no locking.  Only used for internal recursion.
+  void unlockedRefineAbstractTypeTo(const Type *NewType);
+  
 public:
 
   //===--------------------------------------------------------------------===//