Make messages consistent.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68756 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGDecl.cpp

@@ -65,7 +65,7 @@ void CodeGenFunction::EmitBlockVarDecl(const VarDecl &D) {
   
   // We don't support __thread yet.
   if (D.isThreadSpecified())
-    CGM.ErrorUnsupported(&D, "__thread variable", true);
+    CGM.ErrorUnsupported(&D, "thread local ('__thread') variable", true);
   
   switch (D.getStorageClass()) {
   case VarDecl::Static: