[llvm] [RISCV] Add late optimization pass for riscv (PR #133256)

[Craig Topper via llvm-commits]

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@@ -565,6 +566,7 @@ void RISCVPassConfig::addPreEmitPass() {
   if (TM->getOptLevel() >= CodeGenOptLevel::Default &&
       EnableRISCVCopyPropagation)
     addPass(createMachineCopyPropagationPass(true));
+  addPass(createRISCVLateOptPass());
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topperc wrote:

Can we remove this from the O0 pipeline?

https://github.com/llvm/llvm-project/pull/133256