[PowecPC] Hint branch `bne-` for atomic operation after the store-conditional (#152529)

The branches emitted for atomic operations after the store-conditional
are currently not hinted, even though they should be.

According to the Power10 Processor Chip User’s Manual:

` “Without static prediction, if the lock is not acquired in the first
iteration, the branch history mechanism works to update the prediction
to predict taken; that is, predict lock acquisition failure and cause
more lwarx traffic for the next iteration.”`

This patch addresses the issue by adding explicit branch hints for
atomic operations after the store-conditional.

0 files changed, 0 insertions, 0 deletions