Eric Fiselier 541f9e2830 Add _LIBCPP_COMPILER_[CLANG|GCC|MSVC|IBM] macros. ...

This patch refactors the compiler detection done in `__config` by creating a
set of `_LIBCPP_COMPILER_<TYPE>` macros. The goal of this patch is to make
it easier to detect what compiler is being used outside of `__config`.

Additionally this patch removes workarounds for GCC in `__bit_reference`. I
tested GCC 4.8 and 4.9 without the workaround and neither seemed to need it
anymore.

llvm-svn: 291286

2017-01-06 21:42:58 +00:00

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