Make helper functions static.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182589 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaObjCProperty.cpp b/lib/Sema/SemaObjCProperty.cpp
index e49edc9..7770bbd 100644
--- a/lib/Sema/SemaObjCProperty.cpp
+++ b/lib/Sema/SemaObjCProperty.cpp
@@ -717,8 +717,9 @@
 /// DiagnosePropertyMismatchDeclInProtocols - diagnose properties declared
 /// in inherited protocols with mismatched types. Since any of them can
 /// be candidate for synthesis.
-void DiagnosePropertyMismatchDeclInProtocols(Sema &S, SourceLocation AtLoc,
-                                             ObjCInterfaceDecl *ClassDecl,
+static void
+DiagnosePropertyMismatchDeclInProtocols(Sema &S, SourceLocation AtLoc,
+                                        ObjCInterfaceDecl *ClassDecl,
                                         ObjCPropertyDecl *Property) {
   ObjCInterfaceDecl::ProtocolPropertyMap PropMap;
   for (ObjCInterfaceDecl::all_protocol_iterator