[PATCH] [AArch64] Enhance the load/store optimizer to use target-specific alias analysis.

[Chad Rosier]

Minor revisions.

1. Check mayAlias on FirstMI if we're merging forward.
2. Check mayAlias on MI if we're not merging forward.

The previous patch would stop looking for a pair if we encountered an instruction that aliased with FirstMI.  This isn't a problem, however, if we're merging the second instruction into the first.

Correctness still looks good across the board.

Performance looks flat on cortex-a57.  The number of ldp/stp generated increased across the board for all things I tested.


http://reviews.llvm.org/D9863

Files:
  lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
  test/CodeGen/AArch64/arm64-ldp-aa.ll
  test/CodeGen/AArch64/arm64-stp-aa.ll

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