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dix: Use __builtin_popcountl if available to replace Ones()

Alan Coopersmith requested to merge alanc/xserver:ones into master

If the compiler knows of a better algorithm for counting the number of bits set in a word for the target CPU, let it use that, instead of the classic algorithm optimized for PDP-6.

Based on xorg/lib/libxext@490a25e6

Signed-off-by: Alan Coopersmith alan.coopersmith@oracle.com

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