[llvm] [CodeGen][MachineLICM] Use RegUnits in HoistRegionPostRA (PR #94608)

[Pierre van Houtryve via llvm-commits]

================
@@ -423,10 +423,47 @@ static bool InstructionStoresToFI(const MachineInstr *MI, int FI) {
   return false;
 }
 
+static void applyBitsNotInRegMaskToRegUnitsMask(const TargetRegisterInfo &TRI,
----------------
Pierre-vh wrote:

I tried to implement the behavior of `setBitsNotInMask`, is that not what this is doing?

https://github.com/llvm/llvm-project/pull/94608