K 10
svn:author
V 4
jkim
K 8
svn:date
V 27
2016-05-25T23:06:52.343223Z
K 7
svn:log
V 365
Both Clang and GCC cannot generate efficient reserve_pv_entries().

http://docs.freebsd.org/cgi/mid.cgi?552BFEB2.8040407

Re-implement it entirely in inline assembly not to let compilers do silly
spilling to memory.  For non-POPCNT case, use newly added bit_count(3).

Reported by:	alc
Reviewed by:	alc, kib
Differential Revision:	https://reviews.freebsd.org/D6541

END