[PATCH] D137721: [AArch64] Optimize more memcmp when the result is tested for [in]equality with 0

[Allen zhong via Phabricator via llvm-commits]

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We already surpport the or (xor a, b), (xor c, d) with D136244 <https://reviews.llvm.org/D136244>, while it should
capture more cases than just bcmp according the comment on
https://reviews.llvm.org/D136672, so this patch try to fold continuous
comparison series.


https://reviews.llvm.org/D137721

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/bcmp-inline-small.ll
  llvm/test/CodeGen/AArch64/bcmp.ll

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