[PATCH] D88328: [InferAttrs] Improve DSE for libcalls (partial fix for PR47644)

[Dávid Bolvanský via Phabricator via llvm-commits]

xbolva00 created this revision.
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Optimize ```
void f(const char *s) {

  char a[256];
  __builtin_strcpy(a, s);  // dead store

}

  to just empty function.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D88328

Files:
  llvm/lib/Transforms/Utils/BuildLibCalls.cpp
  llvm/test/Transforms/InferFunctionAttrs/annotate.ll
  llvm/test/Transforms/PhaseOrdering/dse-libcalls.ll

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