llvm-project

a314b3b4 - [MachineCopyPropagation] Remove logic to recognise and delete no-op moves produced after forwarded uses (#167336)

[MachineCopyPropagation] Remove logic to recognise and delete no-op moves produced after forwarded uses (#167336) As reported in <https://github.com/llvm/llvm-project/issues/166870>, some copies with src==reg are not no-ops, e.g. when self-assigning a w-reg on AArch64 which will zero-extend the corresponding x register. Revert in order to fix the issue. We may revisit whether the optimisation can be made safe at a later point. Reverts dffbc030e75b758e7512518abd499a0f680addbf. Fixes #166870.