[SubZero] Generate spin-lock for atomic load store
The patch generates LL-SC sequence for atomic load store operations.
64-bit atomic operations are lowered to __sync_*_8 functions.
R=stichnot@chromium.org
Patch from Jaydeep Patil <jaydeep.patil@imgtec.com>.
Review-Url: https://codereview.chromium.org/2682673002 .
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