[FixCode] Apply #selector fixits

These are very useful fixits for migration. Note: this applies the
fixits for selectors that are actually found, but not the one that wraps
an arbitrary string literal in Selector(...), because that one indicates
a possibly missing selector that the user should review.

rdar://problem/26678232

lib/FrontendTool/FrontendTool.cpp

@@ -595,7 +595,9 @@ private:
         Info.ID == diag::function_type_no_parens.ID ||
         Info.ID == diag::convert_let_to_var.ID ||
         Info.ID == diag::parameter_extraneous_double_up.ID ||
-        Info.ID == diag::attr_decl_attr_now_on_type.ID)
+        Info.ID == diag::attr_decl_attr_now_on_type.ID ||
+        Info.ID == diag::selector_construction_suggest.ID ||
+        Info.ID == diag::selector_literal_deprecated_suggest.ID)
       return true;
     return false;
   }