CHROMIUMOS: Add memory barrier implementation for MIPS.

This CL is based on the patch authored by David Turner <digit@google.com>,
see https://code.google.com/p/leveldb/issues/detail?id=109

BUG=chromium:413517
TEST=`emerge-{x86,amd64,arm,mipsel-o32}-generic leveldb`

Change-Id: I85a85a11d0927278ddd437a2702ed690109edff0
Reviewed-on: https://chromium-review.googlesource.com/217834
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
1 file changed