[CodeGen] Use MCRegister in DbgVariableLocation. NFC

Author: topperc

llvm/include/llvm/CodeGen/DebugHandlerBase.h

@@ -30,7 +30,7 @@ class MachineModuleInfo;
 /// Represents the location at which a variable is stored.
 struct DbgVariableLocation {
   /// Base register.
-  unsigned Register;
+  MCRegister Register;
 
   /// Chain of offsetted loads necessary to load the value if it lives in
   /// memory. Every load except for the last is pointer-sized.

llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp

@@ -1361,7 +1361,7 @@ void CodeViewDebug::calculateRanges(
     }
 
     // We can only handle a register or an offseted load of a register.
-    if (Location->Register == 0 || Location->LoadChain.size() > 1)
+    if (!Location->Register || Location->LoadChain.size() > 1)
       continue;
 
     // Codeview can only express byte-aligned offsets, ensure that we have a

llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp

@@ -39,7 +39,7 @@ DbgVariableLocation::extractFromMachineInstruction(
     return std::nullopt;
   if (!Instruction.getDebugOperand(0).isReg())
     return std::nullopt;
-  Location.Register = Instruction.getDebugOperand(0).getReg();
+  Location.Register = Instruction.getDebugOperand(0).getReg().asMCReg();
   Location.FragmentInfo.reset();
   // We only handle expressions generated by DIExpression::appendOffset,
   // which doesn't require a full stack machine.