Portable lzcnt implementation.
Portable lzcnt implementation.

Signed-off-by: Peter Atashian <8f558507d5107f582d32546254a943c98ff671a6@gmail.com>

elwl/NoLifeStory,anydream/NoLifeStory,NoLifeDev/NoLifeStory,KururuLABO/NoLifeStory,anydream/NoLifeStory