[llvm] Revert "[RISCV] Run EarlyMachineLICM before VLOptimizer to hoist constant splats" (PR #210937)

[Pengcheng Wang via llvm-commits]

wangpc-pp wrote:

> I've bisected the hangs on rva20 on the riscv-gauntlet buildbot to this commit:

RVA20 has no V, so this means that the hang is caused by running `EarlyMachineLICM` twice on scalar code? I am inclined to believe this exposes some bugs in `EarlyMachineLICM`.

https://github.com/llvm/llvm-project/pull/210937