Minor cleanup.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@90411 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.h b/lib/CodeGen/CodeGenModule.h
index dbe9c95..b0e1b12 100644
--- a/lib/CodeGen/CodeGenModule.h
+++ b/lib/CodeGen/CodeGenModule.h
@@ -234,7 +234,7 @@
   llvm::Constant *GenerateRTTI(QualType Ty);
   
   /// BuildThunk - Build a thunk for the given method.
-  llvm::Constant *BuildThunk(const GlobalDecl &GD, bool Extern, 
+  llvm::Constant *BuildThunk(GlobalDecl GD, bool Extern, 
                              const ThunkAdjustment &ThisAdjustment);
 
   /// BuildCoVariantThunk - Build a thunk for the given method