Rename CodeGenFunction::EmitMemSetToZero to EmitNullInitialization. Handle setting null data member pointers correctly. Fixes PR7139.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@104387 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGObjC.cpp b/lib/CodeGen/CGObjC.cpp
index 674f502..d44c56f 100644
--- a/lib/CodeGen/CGObjC.cpp
+++ b/lib/CodeGen/CGObjC.cpp
@@ -632,7 +632,7 @@
   // Fast enumeration state.
   QualType StateTy = getContext().getObjCFastEnumerationStateType();
   llvm::Value *StatePtr = CreateMemTemp(StateTy, "state.ptr");
-  EmitMemSetToZero(StatePtr, StateTy);
+  EmitNullInitialization(StatePtr, StateTy);
 
   // Number of elements in the items array.
   static const unsigned NumItems = 16;