[llvm] [MachineLICM] Hoist copies of constant physical register (PR #93285)

[Matt Arsenault via llvm-commits]

================
@@ -1269,8 +1269,9 @@ bool MachineLICMBase::IsProfitableToHoist(MachineInstr &MI,
     Register DefReg = MI.getOperand(0).getReg();
     if (DefReg.isVirtual() &&
         all_of(MI.uses(),
-               [](const MachineOperand &UseOp) {
-                 return !UseOp.isReg() || UseOp.getReg().isVirtual();
+               [&](const MachineOperand &UseOp) {
+                 return !UseOp.isReg() || UseOp.getReg().isVirtual() ||
+                        MRI->isConstantPhysReg(UseOp.getReg());
----------------
arsenm wrote:

MRI is only capture, 
```suggestion
               [=this](const MachineOperand &UseOp) {
                 return !UseOp.isReg() || UseOp.getReg().isVirtual() ||
                        MRI->isConstantPhysReg(UseOp.getReg());
```

https://github.com/llvm/llvm-project/pull/93285