[llvm-branch-commits] [llvm] CodeGen: Stop checking for physregs in constrainRegClass (PR #161795)

[Christudasan Devadasan via llvm-branch-commits]

================
@@ -83,8 +83,6 @@ constrainRegClass(MachineRegisterInfo &MRI, Register Reg,
 
 const TargetRegisterClass *MachineRegisterInfo::constrainRegClass(
     Register Reg, const TargetRegisterClass *RC, unsigned MinNumRegs) {
-  if (Reg.isPhysical())
----------------
cdevadas wrote:

What if someone unkonwingly uses this function post-RA? 

https://github.com/llvm/llvm-project/pull/161795