Update for LLVM API change.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77722 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGCall.cpp b/lib/CodeGen/CGCall.cpp
index d7019b6..be30fcc 100644
--- a/lib/CodeGen/CGCall.cpp
+++ b/lib/CodeGen/CGCall.cpp
@@ -513,7 +513,7 @@
     if (FD->hasImplicitReturnZero()) {
       QualType RetTy = FD->getResultType().getUnqualifiedType();
       const llvm::Type* LLVMTy = CGM.getTypes().ConvertType(RetTy);
-      llvm::Constant* Zero = CGM.getLLVMContext().getNullValue(LLVMTy);
+      llvm::Constant* Zero = llvm::Constant::getNullValue(LLVMTy);
       Builder.CreateStore(Zero, ReturnValue);
     }
   }