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

[Michael Maitland via llvm-commits]

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@@ -307,6 +307,13 @@ class RISCVInstrInfo : public RISCVGenInstrInfo {
   static bool isLdStSafeToPair(const MachineInstr &LdSt,
                                const TargetRegisterInfo *TRI);
 
+  static bool evaluateCondBranch(unsigned CC, int64_t C0, int64_t C1);
+
+  static bool isLoadImm(const MachineInstr *MI, int64_t &Imm);
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michaelmaitland wrote:

Do we need to define this function or can this be a lambda inside of `isFromLoadImm`? I think isFromLoadImm is the only caller of isLoadImm.

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