[PATCH] D111128: TailDuplication: do not remove trivial PHIs from addr-taken blocks.

[Tim Northover via Phabricator via llvm-commits]

t.p.northover created this revision.
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Unlike an anonymous block, it will not be removed even though we've resolved all valid paths to get here. So removing a PHI can leave vregs with no definition, violating SSA. Instead, this converts it to an `IMPLICIT_DEF`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D111128

Files:
  llvm/lib/CodeGen/TailDuplicator.cpp
  llvm/test/CodeGen/AArch64/taildup-addrtaken.mir

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