[issue1770] Patch for i386 to use bsrl for libc fls().
Venkatesh Srinivas <me@acm.jhu.edu> added the comment:
I just tested the i386 fls against its C equivalent on every input, to see that
it produces the same output; it passed. Running the C version, optimized by
gcc, took 49 sec on my hardware, the assembler version 10sec.
The x86_64 version is tested on a few test inputs, but not in the Dfly libc,
only as standalone .S files.
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