[PATCH] D139872: [llvm][CallBrPrepare] split critical edges

[Nick Desaulniers via Phabricator via llvm-commits]

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If we have a CallBrInst with output that's used, we need to split
critical edges so that we have some place to insert COPYs for physregs
to virtregs.

Part 2a of
https://discourse.llvm.org/t/rfc-syncing-asm-goto-with-outputs-with-gcc/65453/8.

Test cases and logic re-purposed from D138078 <https://reviews.llvm.org/D138078>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D139872

Files:
  llvm/lib/CodeGen/CallBrPrepare.cpp
  llvm/test/CodeGen/AArch64/callbr-prepare.ll

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