added two different __BitScanForward() functions.
added two different __BitScanForward() functions.

Signed-off-by: shines77 <c816ee361b8bcaf7cf19d627e3bc89a63016b2b4@msn.com>

shines77/jemalloc-win32,shines77/jemalloc-win32,shines77/jemalloc-win32,shines77/jemalloc-win32