Pass a GlobalDecl to setFunctionDefinitionAttributes. NFC.

This just makes a followup patch easier to read.

llvm-svn: 326265
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index c8b2d78..40a9d93 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -1183,8 +1183,7 @@
   bool TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D);
 
   /// Set attributes for a global definition.
-  void setFunctionDefinitionAttributes(const FunctionDecl *D,
-                                       llvm::Function *F);
+  void setFunctionDefinitionAttributes(GlobalDecl GD, llvm::Function *F);
 
   llvm::GlobalValue *GetGlobalValue(StringRef Ref);