Amara Emerson f270a4dd66 [AArch64] Don't tail call memset if it would convert to a bzero. (#98969) ...

Well, not quite that simple. We can tc memset since it returns the first
argument but bzero doesn't do that and therefore we can end up
miscompiling.

This patch also refactors the logic out of isInTailCallPosition() into the callers.
As a result memcpy and memmove are also modified to do the same thing
for consistency.

rdar://131419786

2024-07-17 01:31:52 -07:00

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