[llvm] [RegAlloc][X86] Rematerialization of instructions with physical register (PR #198853)

[Matt Arsenault via llvm-commits]

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@@ -146,17 +146,43 @@ bool VirtRegAuxInfo::isRematerializable(const LiveInterval &LI,
   return true;
 }
 
-bool VirtRegAuxInfo::allUsesAvailableAt(const MachineInstr *MI,
+bool VirtRegAuxInfo::allUsesAvailableAt(const MachineInstr *OrigMI,
                                         SlotIndex UseIdx,
                                         const LiveIntervals &LIS,
                                         const MachineRegisterInfo &MRI,
                                         const TargetInstrInfo &TII) {
-  SlotIndex OrigIdx = LIS.getInstructionIndex(*MI).getRegSlot(true);
+  SlotIndex OrigIdx = LIS.getInstructionIndex(*OrigMI).getRegSlot(true);
+  auto MBB = LIS.getMBBFromIndex(UseIdx);
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arsenm wrote:

No auto 

https://github.com/llvm/llvm-project/pull/198853