CodeGen: Fix a use-after-free in TII
Found by ASAN with the recycling allocator changes from PR26808.
llvm-svn: 264443
diff --git a/llvm/lib/CodeGen/TargetInstrInfo.cpp b/llvm/lib/CodeGen/TargetInstrInfo.cpp
index eccd1e8..86517d9 100644
--- a/llvm/lib/CodeGen/TargetInstrInfo.cpp
+++ b/llvm/lib/CodeGen/TargetInstrInfo.cpp
@@ -107,13 +107,15 @@
while (!MBB->succ_empty())
MBB->removeSuccessor(MBB->succ_begin());
+ // Save off the debug loc before erasing the instruction.
+ DebugLoc DL = Tail->getDebugLoc();
+
// Remove all the dead instructions from the end of MBB.
MBB->erase(Tail, MBB->end());
// If MBB isn't immediately before MBB, insert a branch to it.
if (++MachineFunction::iterator(MBB) != MachineFunction::iterator(NewDest))
- InsertBranch(*MBB, NewDest, nullptr, SmallVector<MachineOperand, 0>(),
- Tail->getDebugLoc());
+ InsertBranch(*MBB, NewDest, nullptr, SmallVector<MachineOperand, 0>(), DL);
MBB->addSuccessor(NewDest);
}