[OpenCL] Allow variadic macros as Clang feature.

llvm-svn: 356987
diff --git a/clang/lib/Lex/PPDirectives.cpp b/clang/lib/Lex/PPDirectives.cpp
index 1850af9..16d61c7 100644
--- a/clang/lib/Lex/PPDirectives.cpp
+++ b/clang/lib/Lex/PPDirectives.cpp
@@ -2181,8 +2181,7 @@
 
       // OpenCL v1.2 s6.9.e: variadic macros are not supported.
       if (LangOpts.OpenCL) {
-        Diag(Tok, diag::err_pp_opencl_variadic_macros);
-        return true;
+        Diag(Tok, diag::ext_pp_opencl_variadic_macros);
       }
 
       // Lex the token after the identifier.