[MIParser] Don't use Register to hold Dwarf register numbers. NFC (llvm#125263)

Author: topperc

llvm/lib/CodeGen/MIRParser/MIParser.cpp

@@ -485,7 +485,7 @@ class MIParser {
   bool parseDILocation(MDNode *&Expr);
   bool parseMetadataOperand(MachineOperand &Dest);
   bool parseCFIOffset(int &Offset);
-  bool parseCFIRegister(Register &Reg);
+  bool parseCFIRegister(unsigned &Reg);
   bool parseCFIAddressSpace(unsigned &AddressSpace);
   bool parseCFIEscapeValues(std::string& Values);
   bool parseCFIOperand(MachineOperand &Dest);
@@ -2446,7 +2446,7 @@ bool MIParser::parseCFIOffset(int &Offset) {
   return false;
 }
 
-bool MIParser::parseCFIRegister(Register &Reg) {
+bool MIParser::parseCFIRegister(unsigned &Reg) {
   if (Token.isNot(MIToken::NamedRegister))
     return error("expected a cfi register");
   Register LLVMReg;
@@ -2491,7 +2491,7 @@ bool MIParser::parseCFIOperand(MachineOperand &Dest) {
   auto Kind = Token.kind();
   lex();
   int Offset;
-  Register Reg;
+  unsigned Reg;
   unsigned AddressSpace;
   unsigned CFIIndex;
   switch (Kind) {
@@ -2564,7 +2564,7 @@ bool MIParser::parseCFIOperand(MachineOperand &Dest) {
     CFIIndex = MF.addFrameInst(MCCFIInstruction::createUndefined(nullptr, Reg));
     break;
   case MIToken::kw_cfi_register: {
-    Register Reg2;
+    unsigned Reg2;
     if (parseCFIRegister(Reg) || expectAndConsume(MIToken::comma) ||
         parseCFIRegister(Reg2))
       return true;