[PATCH] D153932: [AliasAnalysis] Mark fences as not Mod'ing unescaped local values

[Arthur Eubanks via Phabricator via llvm-commits]

aeubanks created this revision.
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Addresses a regression reported in D145210 <https://reviews.llvm.org/D145210>.

Unescaped local values cannot be Mod'd by fences since other threads
either cannot know the address (unescaped alloca) or it would be UB
(noalias).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D153932

Files:
  llvm/lib/Analysis/AliasAnalysis.cpp
  llvm/test/Transforms/EarlyCSE/fence.ll
  llvm/test/Transforms/GVN/fence.ll

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