[PATCH] D149146: [TailDuplicator] Don't constrain register classes due to debug instructions

[Mikael Holmén via Phabricator via llvm-commits]

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If cloning a DBG_VALUE instruction, register uses in that instruction could
lead to constraining of a virtual register that would not happen if the
DBG_VALUE was not present at all. This lead to different code with/without
debug info.

Now we only do that register class constraining if we dealing with a non
debug instruction.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149146

Files:
  llvm/lib/CodeGen/TailDuplicator.cpp
  llvm/test/CodeGen/AArch64/tail-duplicate-debug-variance.mir

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