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Implement __builtin_clz in MSVC #102

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Implement __builtin_clz in MSVC #102

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Commits on May 21, 2018

  1. Utilize _BitScanReverse in Visual Studio 

    _BitScanReverse is documented here:
https://msdn.microsoft.com/en-us/library/fbxyd7zd.aspx
This improves speed of a VS2015 x64 build by more than 10%.
    @JayXon
    JayXon committed May 21, 2018
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