Fix clang breakage, CGF can be null in this context.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@78269 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExprConstant.cpp b/lib/CodeGen/CGExprConstant.cpp
index eb9c982..047fecd 100644
--- a/lib/CodeGen/CGExprConstant.cpp
+++ b/lib/CodeGen/CGExprConstant.cpp
@@ -340,7 +340,7 @@
       return 0;
     
     llvm::Constant *Result = 
-      llvm::ConstantStruct::get(CGF->getLLVMContext(),
+      llvm::ConstantStruct::get(CGM.getLLVMContext(),
                                 Builder.Elements, Builder.Packed);
 
     assert(llvm::RoundUpToAlignment(Builder.NextFieldOffsetInBytes,