[FFmpeg-devel] [PATCH] avutil/intmath: enable builtin intrinsics for icl and msvc.

[Matt Oliver]

intmath.h already uses the gcc builtin intrinsics for log2 and ctz. This
patch just adds the equivalent icl and msvc intrinsics. All added
intrinsics have the same function (i.e. with respect to input 0s etc.) as
the existing gcc builtins.
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