Make messages consistent.

llvm-svn: 68756
diff --git a/clang/lib/CodeGen/CGDecl.cpp b/clang/lib/CodeGen/CGDecl.cpp
index 00eb8b4..2060b5c 100644
--- a/clang/lib/CodeGen/CGDecl.cpp
+++ b/clang/lib/CodeGen/CGDecl.cpp
@@ -65,7 +65,7 @@
   
   // 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: