fix compiler warnings

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52089 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp
index 7f9f349..70a6f66 100644
--- a/lib/CodeGen/CGDebugInfo.cpp
+++ b/lib/CodeGen/CGDebugInfo.cpp
@@ -46,8 +46,8 @@
 , GlobalVariableAnchor(NULL)
 , RegionStack()
 , VariableDescList()
-, GlobalVarDescList(NULL)
-, EnumDescList(NULL)
+, GlobalVarDescList()
+, EnumDescList()
 , Subprogram(NULL)
 {
   SR = new llvm::DISerializer();