MachineVerifier: Fix printing nonsense for physical registers

[MatzeB]

LGTM.

lib/CodeGen/MachineVerifier.cpp

480

Could you rename that parameter from Reg to something like VRegUnit?

[arsenm]

r276677

lib/CodeGen/MachineVerifier.cpp

 
 void MachineVerifier::report_context(const LiveInterval &LI) const {
   errs() << "- interval:    " << LI << '\n';
 }
 
 void MachineVerifier::report_context(const LiveRange &LR, unsigned Reg,
                                      LaneBitmask LaneMask) const {
   report_context_liverange(LR);
-  errs() << "- register:    " << PrintReg(Reg, TRI) << '\n';
+  report_context_vreg_regunit(Reg);
   if (LaneMask != 0)
     report_context_lanemask(LaneMask);
 }
 
 void MachineVerifier::report_context(const LiveRange::Segment &S) const {
   errs() << "- segment:     " << S << '\n';
 }