diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/lib/CodeGen/MachineScheduler.cpp
@@ -750,7 +750,7 @@
 }
 
 bool ScheduleDAGMI::checkSchedLimit() {
-#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+#if LLVM_ENABLE_ABI_BREAKING_CHECKS && !defined(NDEBUG)
   if (NumInstrsScheduled == MISchedCutoff && MISchedCutoff != ~0U) {
     CurrentTop = CurrentBottom;
     return false;