[boost] [1.47.0] Regression in type_traits, is it too late to revert?

There's a regression in type_traits caused by the addition of compiler-intrinsic support for Clang - this got reverted on Trunk after a flurry of discussion a while back: http://lists.boost.org/Archives/boost/2011/06/182844.php. Unfortunately it appears it never got reverted on the release branch. Can we please revert this? Thanks, John.