[llvm] [RISCV] Run DeadMachineInstructionElim after regalloc (PR #90598)

[Luke Lau via llvm-commits]

lukel97 wrote:

> Are there any post-RA or even post-SSA uses of this pass on any other target? All I found were uses still in SSA form.

No, it seemed ok from reading the pass implementation. But I actually think we can use LiveIntervals to check for dead immediates #90629. I'd prefer this approach, so closing this for now.


https://github.com/llvm/llvm-project/pull/90598