Make helper function static.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187574 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/VTableBuilder.cpp b/lib/AST/VTableBuilder.cpp
index 81970f1..9067b4b 100644
--- a/lib/AST/VTableBuilder.cpp
+++ b/lib/AST/VTableBuilder.cpp
@@ -3125,8 +3125,8 @@
   }
 }
 
-void EnumerateVFPtrs(ASTContext &Context, const CXXRecordDecl *ForClass,
-                     MicrosoftVFTableContext::VFPtrListTy &Result) {
+static void EnumerateVFPtrs(ASTContext &Context, const CXXRecordDecl *ForClass,
+                            MicrosoftVFTableContext::VFPtrListTy &Result) {
   Result.clear();
   const ASTRecordLayout &ClassLayout = Context.getASTRecordLayout(ForClass);
   BasesSetVectorTy VisitedVBases;