[llvm] [RISCV] Add branch folding before branch relaxation (PR #134760)

[Matt Arsenault via llvm-commits]

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@@ -570,6 +570,7 @@ void RISCVPassConfig::addPreEmitPass() {
     addPass(createMachineCopyPropagationPass(true));
   if (TM->getOptLevel() >= CodeGenOptLevel::Default)
     addPass(createRISCVLateBranchOptPass());
+  addPass(&BranchFolderPassID);
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arsenm wrote:

It should have run already? I'd expect a "late branch opt" pass to avoid introducing new constructs that need cleanup 

https://github.com/llvm/llvm-project/pull/134760