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2bb6264105
For cases when returning early without updating any pixels, we
previously returned to return address in the caller's scope,
bypassing one function entirely. While this may seem like a neat
optimization, it makes the return stack predictor mispredict
the returns - which potentially can cost more performance than
it gains.
Secondly, if the armv9.3 feature GCS (Guarded Control Stack) is
enabled, then returns _must_ match the expected value; this feature
is being enabled across linux distributions, and by fixing the
hevc assembly, we can enable the security feature on ffmpeg as well.
(cherry picked from commit 1f7ed8a78d)