Make helper functions static.

llvm-svn: 175265
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index d2b4697..d425902 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/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;