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Author SHA1 Message Date
kwiberg
729b21f97f Add clz functions (Count number of Leading Zero bits), 32-and 64-bit variants 
Using __builtin_clz on gcc/clang, and a fallback implementation
otherwise.

Also redefine WebRtcSpl_GetSizeInBits(x) as simply 32 - clz32(x).

BUG=chromium:601787

Review-Url: https://codereview.webrtc.org/2014023002
Cr-Commit-Position: refs/heads/master@{#13014}
 2016-06-02 11:02:22 +00:00