[llvm] [LiveIns] Improve recomputeLiveIns() (PR #88951)

[Kai Nacke via llvm-commits]

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@@ -197,16 +197,16 @@ void computeAndAddLiveIns(LivePhysRegs &LiveRegs,
 
 /// Convenience function for recomputing live-in's for a MBB. Returns true if
 /// any changes were made.
-static inline bool recomputeLiveIns(MachineBasicBlock &MBB) {
+inline bool recomputeLiveIns(MachineBasicBlock &MBB) {
   LivePhysRegs LPR;
-  auto oldLiveIns = MBB.getLiveIns();
+  std::vector<MachineBasicBlock::RegisterMaskPair> OldLiveIns;
 
-  MBB.clearLiveIns();
+  MBB.clearLiveIns(OldLiveIns);
   computeAndAddLiveIns(LPR, MBB);
   MBB.sortUniqueLiveIns();
 
-  auto newLiveIns = MBB.getLiveIns();
-  return oldLiveIns != newLiveIns;
+  auto NewLiveIns = MBB.getLiveIns();
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redstar wrote:

Changed.

https://github.com/llvm/llvm-project/pull/88951