[llvm] [AArch64] Run cleanup one final time after peephole (PR #199711)

[via llvm-commits]

AZero13 wrote:

It seems the FIRST DCE pass is not needed for most targets, so how about I remove that for all but x86 instead if it results in no regressions? @nikic 

https://github.com/llvm/llvm-project/pull/199711