CodeGen: More accurate mayAlias for instructions with multiple MMOs (#166211)

There can only be meaningful aliasing between the memory accesses of
different instructions if at least one of the accesses modifies memory.

This check is applied at the instruction-level earlier in the method.
This change merely extends the check on a per-MMO basis.

This affects a SystemZ test because PFD instructions are both mayLoad
and mayStore but may carry a load-only MMO which is now no longer
treated as aliasing loads. The PFD instructions are from llvm.prefetch
generated by loop-data-prefetch.

0 files changed, 0 insertions, 0 deletions