[PATCH] [Support] Add BitHacks.h - generic bit utility functions.

[Michael Spencer]

I need generic bit utility functions for lld, so I wrote these. The main additional functionality is giving a choice of behavior on zero, and being generic instead of having _32 and _64 versions.

The signed version of most of these functions are marked = delete; As the operation doesn't make sense in C++.

I plan to move all users of the versions in MathExtras.h over to this.

http://llvm-reviews.chandlerc.com/D841

Files:
  include/llvm/Support/BitHacks.h
  unittests/Support/BitHacksTest.cpp
  unittests/Support/CMakeLists.txt
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