[llvm] [AMDGPU] Don't use MCRegister to hold Dwarf register numbers. NFC (PR #216766)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Craig Topper (topperc)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/216766.diff


1 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/SIFrameLowering.cpp (+3-3) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp b/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
index 158a83fd61cf4..0d31943cdefa8 100644
--- a/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
@@ -1135,7 +1135,7 @@ void SIFrameLowering::emitPrologueEntryCFI(MachineBasicBlock &MBB,
       return;
     if (IsCalleeSaved.test(Reg) || !MRI.isPhysRegModified(Reg))
       return;
-    MCRegister DwarfReg = MCRI->getDwarfRegNum(Reg, false);
+    unsigned DwarfReg = MCRI->getDwarfRegNum(Reg, false);
     buildCFI(MBB, MBBI, DL,
              MCCFIInstruction::createUndefined(nullptr, DwarfReg));
   };
@@ -2546,7 +2546,7 @@ MachineInstr *SIFrameLowering::buildCFIForVRegToVRegSpill(
   const MCRegisterInfo &MCRI = *MF.getContext().getRegisterInfo();
   const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
 
-  MCRegister MaskReg = MCRI.getDwarfRegNum(
+  unsigned MaskReg = MCRI.getDwarfRegNum(
       ST.isWave32() ? AMDGPU::EXEC_LO : AMDGPU::EXEC, false);
   auto CFIInst = MCCFIInstruction::createLLVMVectorRegisterMask(
       nullptr, MCRI.getDwarfRegNum(Reg, false),
@@ -2626,7 +2626,7 @@ MachineInstr *SIFrameLowering::buildCFIForVGPRToVMEMSpill(
   int DwarfVGPR = MCRI.getDwarfRegNum(VGPR, false);
   assert(DwarfVGPR != -1);
 
-  MCRegister MaskReg = MCRI.getDwarfRegNum(
+  unsigned MaskReg = MCRI.getDwarfRegNum(
       ST.isWave32() ? AMDGPU::EXEC_LO : AMDGPU::EXEC, false);
   auto CFIInst = MCCFIInstruction::createLLVMVectorOffset(
       nullptr, DwarfVGPR, VGPRLaneBitSize, MaskReg, ST.getWavefrontSize(),

``````````

</details>


https://github.com/llvm/llvm-project/pull/216766