[FixCode] Make sure to accept the fixit in warning about 'where' syntax change.

lib/FrontendTool/FrontendTool.cpp

@@ -603,6 +603,7 @@ private:
         Info.ID == diag::attr_decl_attr_now_on_type.ID ||
         Info.ID == diag::noescape_parameter.ID ||
         Info.ID == diag::noescape_autoclosure.ID ||
+        Info.ID == diag::where_inside_brackets.ID ||
         Info.ID == diag::selector_construction_suggest.ID ||
         Info.ID == diag::selector_literal_deprecated_suggest.ID)
       return true;