[llvm] [clang-tools-extra] [clang] [RISCV] Eliminate dead li after emitting VSETVLIs (PR #65934)

[Luke Lau via llvm-commits]

lukel97 wrote:

Oh nice, I'm running into something similar in https://github.com/llvm/llvm-project/pull/71657. Are all these dead ADDIs instructions coming from the backwards local postpass? 

https://github.com/llvm/llvm-project/pull/65934