Re: [boost] [TypeTraits] A patch for clang's intrinsics (was: [type_traits] is_enum on scoped enums doesn't works as expected)

Let's proceed step by step. As a first step, I made a patch to use clang's intrinsics except problematic intrinsics (i.e. `is_pod` and `is_empty`).

All the tests run successfully on gcc-4.4, 4.5, 4.6, clang (trunk) and Mac OS X Lion's clang (Apple clang version 2.1).

Applied, thanks! John.