Avoid copying LiveInterval, this could lead to a double-delete

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231154 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/AArch64/AArch64PBQPRegAlloc.cpp b/lib/Target/AArch64/AArch64PBQPRegAlloc.cpp
index 4690177d02950c76ae29546b2428a60c684f0bf6..5394875a6bc12f96ef219bddf8f9fafe56dcea05 100644 (file)
--- a/lib/Target/AArch64/AArch64PBQPRegAlloc.cpp
+++ b/lib/Target/AArch64/AArch64PBQPRegAlloc.cpp
@@ -319,7 +319,7 @@ void A57ChainingConstraint::addInterChainConstraint(PBQPRAGraph &G, unsigned Rd,
 
 static bool regJustKilledBefore(const LiveIntervals &LIs, unsigned reg,
                                 const MachineInstr &MI) {
-  LiveInterval LI = LIs.getInterval(reg);
+  const LiveInterval &LI = LIs.getInterval(reg);
   SlotIndex SI = LIs.getInstructionIndex(&MI);
   return LI.expiredAt(SI);
 }