This PR fixes a build issue with the version of Clang installed with MSVC. #65
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Versions of Clang installed with MSVC define both clang and _MSC_VER. Since the intrin.h header is not included, the _BitScanReverse() function is not defined. However, instead of including intrin.h if _MSC_VER is defined, I chose to use Clang's __builtin_clz() function which is still available.