[llvm] Rebased save csr in ra (PR #131845)

[Michael Maitland via llvm-commits]

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@@ -582,6 +582,8 @@ void RISCVPassConfig::addPreEmitPass2() {
   addPass(createUnpackMachineBundles([&](const MachineFunction &MF) {
     return MF.getFunction().getParent()->getModuleFlag("kcfi");
   }));
+
+  addPass(createCFIInstrInserter());
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michaelmaitland wrote:

Why did we previously not need this pass? Didn't we used to emit CFI Instrs?

https://github.com/llvm/llvm-project/pull/131845