Change in coreboot[master]: lib: Add __fls() (Find Last Set)

[Yu-Ping Wu (Code Review)]

Attention is currently required from: Hung-Te Lin, Shelley Chen, Paul Menzel, Julius Werner, Jianjun Wang.
Yu-Ping Wu has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/59738 )

Change subject: lib: Add __fls() (Find Last Set)
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Patch Set 5:

(3 comments)

File payloads/libpayload/include/libpayload.h:

https://review.coreboot.org/c/coreboot/+/59738/comment/c19eafd4_ed0b0120 
PS5, Line 460: /* Find Last Set: __fls(1) == 0, fls(5) == 2, fls(1 << 31) == 31 */
same

File src/commonlib/bsd/include/commonlib/bsd/helpers.h:

https://review.coreboot.org/c/coreboot/+/59738/comment/edfa4152_7a394212 
PS1, Line 137: fls
> I just add it as the alias for log2(), do we still need to add unit tests in this case.

yes please

File src/include/lib.h:

https://review.coreboot.org/c/coreboot/+/59738/comment/4a893c48_3ef18f36 
PS5, Line 56: /* Find Last Set: __fls(1) == 0, fls(5) == 2, fls(1 << 31) == 31 */
__fls, not fls