[llvm] [RISCV][TII] Add and use new hook to optimize/canonicalize instructions after MachineCopyPropagation (PR #137973)

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git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- llvm/include/llvm/CodeGen/TargetInstrInfo.h llvm/lib/CodeGen/MachineCopyPropagation.cpp llvm/lib/Target/RISCV/RISCVInstrInfo.cpp llvm/lib/Target/RISCV/RISCVInstrInfo.h
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View the diff from clang-format here.
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diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfo.cpp b/llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
index da5e4086a..50bb7f62a 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
@@ -3990,7 +3990,8 @@ bool RISCVInstrInfo::optimizeInstruction(MachineInstr &MI) const {
     // and rd, zero, rs => addi rd, zero, 0
     // mul* rd, rs, zero => addi rd, zero, 0
     // mul* rd, zero, rs => addi rd, zero, 0
-    if (MI.getOperand(1).getReg() == RISCV::X0 || MI.getOperand(2).getReg() == RISCV::X0) {
+    if (MI.getOperand(1).getReg() == RISCV::X0 ||
+        MI.getOperand(2).getReg() == RISCV::X0) {
       MI.getOperand(1).setReg(RISCV::X0);
       MI.getOperand(2).ChangeToImmediate(0);
       MI.setDesc(get(RISCV::ADDI));

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https://github.com/llvm/llvm-project/pull/137973