d04047cc29bbc9d1f87a9346d1601e3dd87b6ca0 broken MSVC builds

[Jason Evans]

On May 29, 2014, at 12:44 AM, Mike Hommey <mh+jemalloc at glandium.org> wrote:
> d04047cc29bbc9d1f87a9346d1601e3dd87b6ca0 makes rtree.exe assert:
> <jemalloc>: z:\jemalloc-dev\include\jemalloc/internal/arena.h:553:
> Failed assertion: "ret == small_size2bin_compute(size)"

Fixed:

	https://github.com/jemalloc/jemalloc/commit/0b5c92213fbafc52c5b5a5dc84e91eacc812ae0b

I apparently neglected to test the fallback implementations of lg_floor(), and perhaps unsurprisingly, both of them were broken.

Thanks,
Jason