[llvm] [RISCV] Add late optimization pass for RISC-V to optimize branch instructions (PR #131728)

[Sam Elliott via llvm-commits]

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@@ -567,6 +568,7 @@ void RISCVPassConfig::addPreEmitPass() {
     addPass(createMachineCopyPropagationPass(true));
   addPass(&BranchRelaxationPassID);
   addPass(createRISCVMakeCompressibleOptPass());
+  addPass(createRISCVLatePeepholeOptPass());
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lenary wrote:

I would put it immediately before branch relaxation, unless you're also sure that machine copy propagation won't also introduce these kinds of branches.

https://github.com/llvm/llvm-project/pull/131728