Make helper functions static.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@163505 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp b/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
index eef29cb..39cfc8e 100644
--- a/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
@@ -80,8 +80,8 @@
   C.EmitReport(R);
 }
 
-StringRef describeUninitializedArgumentInCall(const CallEvent &Call,
-                                              bool IsFirstArgument) {
+static StringRef describeUninitializedArgumentInCall(const CallEvent &Call,
+                                                     bool IsFirstArgument) {
   switch (Call.getKind()) {
   case CE_ObjCMessage: {
     const ObjCMethodCall &Msg = cast<ObjCMethodCall>(Call);