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

[Matt Arsenault via llvm-commits]

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@@ -90,10 +90,13 @@ namespace {
 
   /// BranchFolderPass - Wrap branch folder in a machine function pass.
 class BranchFolderLegacy : public MachineFunctionPass {
+  bool EnableTailMerge;
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arsenm wrote:

That added the initial port to the new pm. This is now changing the pass arguments in the old PM, without the matching new PM change 

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