Implement __builtin_popcount under MSVC
Summary: I thought I had already implemented this, but apparently I had only implemented the ll variable. Whoops. This implements the 32-bit version which fixes the build on Windows. Reviewed By: yfeldblum Differential Revision: D5203680 fbshipit-source-id: 02b133db59e232cac586944b0ffc0e8bbf5f533a
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