[llvm] Increase NumVisited limit to 18 (PR #80627)

[Nikita Popov via llvm-commits]

================
@@ -918,11 +918,11 @@ bool TwoAddressInstructionPass::rescheduleMIBelowKill(
   MachineBasicBlock::iterator KillPos = KillMI;
   ++KillPos;
   for (MachineInstr &OtherMI : make_range(End, KillPos)) {
+    if (NumVisited >= 18) // FIXME: Arbitrary limit to reduce compile time cost.
+      return false;
----------------
nikic wrote:

This check must come after isDebug, otherwise you will break debug invariance.

https://github.com/llvm/llvm-project/pull/80627