[RegisterBankInfo] Use MCRegister instead of Register for getMinimalPhysRegClass. NFC

Author: topperc

llvm/include/llvm/CodeGen/RegisterBankInfo.h

@@ -419,7 +419,7 @@ class RegisterBankInfo {
 
   /// Getting the minimal register class of a physreg is expensive.
   /// Cache this information as we get it.
-  mutable DenseMap<unsigned, const TargetRegisterClass *> PhysRegMinimalRCs;
+  mutable DenseMap<MCRegister, const TargetRegisterClass *> PhysRegMinimalRCs;
 
   /// Create a RegisterBankInfo that can accommodate up to \p NumRegBanks
   /// RegisterBank instances.
@@ -445,7 +445,7 @@ class RegisterBankInfo {
   /// Get the MinimalPhysRegClass for Reg.
   /// \pre Reg is a physical register.
   const TargetRegisterClass *
-  getMinimalPhysRegClass(Register Reg, const TargetRegisterInfo &TRI) const;
+  getMinimalPhysRegClass(MCRegister Reg, const TargetRegisterInfo &TRI) const;
 
   /// Try to get the mapping of \p MI.
   /// See getInstrMapping for more details on what a mapping represents.

llvm/lib/CodeGen/RegisterBankInfo.cpp

@@ -100,9 +100,8 @@ RegisterBankInfo::getRegBank(Register Reg, const MachineRegisterInfo &MRI,
 }
 
 const TargetRegisterClass *
-RegisterBankInfo::getMinimalPhysRegClass(Register Reg,
+RegisterBankInfo::getMinimalPhysRegClass(MCRegister Reg,
                                          const TargetRegisterInfo &TRI) const {
-  assert(Reg.isPhysical() && "Reg must be a physreg");
   const auto [RegRCIt, Inserted] = PhysRegMinimalRCs.try_emplace(Reg);
   if (Inserted)
     RegRCIt->second = TRI.getMinimalPhysRegClassLLT(Reg, LLT());