Make helper functions static.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175265 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index d2b4697..d425902 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -2065,8 +2065,8 @@
   return ABIDefaultCC == CC;
 }
 
-template<typename T>
-bool haveIncompatibleLanguageLinkages(const T *Old, const T *New) {
+template <typename T>
+static bool haveIncompatibleLanguageLinkages(const T *Old, const T *New) {
   const DeclContext *DC = Old->getDeclContext();
   if (DC->isRecord())
     return false;