Provide basic support for generation of objc2's 
objc_assign_global API when assigning to global
objective-c object pointer.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70939 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index 2bcb362..74d7364 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -442,7 +442,10 @@
     else
       CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst);
 #endif
-    CGM.getObjCRuntime().EmitObjCStrongCastAssign(*this, src, LvalueDst);
+    if (Dst.isGlobalObjCRef())
+      CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst);
+    else
+      CGM.getObjCRuntime().EmitObjCStrongCastAssign(*this, src, LvalueDst);
     return;
   }
   
@@ -666,6 +669,8 @@
     LValue LV = LValue::MakeAddr(CGM.GetAddrOfGlobalVar(VD),
                                  E->getType().getCVRQualifiers(),
                                  getContext().getObjCGCAttrKind(E->getType()));
+    if (LV.isObjCStrong())
+      LV.SetGlobalObjCRef(LV, true);
     return LV;
   } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) {
     return LValue::MakeAddr(CGM.GetAddrOfFunction(FD),