K 10
svn:author
V 6
jrtc27
K 8
svn:date
V 27
2020-12-14T00:47:59.487862Z
K 7
svn:log
V 497
mips: Fix sub-word atomics implementation

These aligned the address but then always used the least significant
bits of the value in memory, which is the wrong half 50% of the time for
16-bit atomics and the wrong quarter 75% of the time for 8-bit atomics.
These bugs were all present in r178172, the commit that added the mips
port, and have remained for its entire existence to date.

Reviewed by:	jhb (mentor)
Approved by:	jhb (mentor)
Differential Revision:	https://reviews.freebsd.org/D27343

END