Index: lib/CodeGen/MachineScheduler.cpp
===================================================================
--- lib/CodeGen/MachineScheduler.cpp
+++ lib/CodeGen/MachineScheduler.cpp
@@ -2159,6 +2159,8 @@
       HazardRec->Reset();
     }
     HazardRec->EmitInstruction(SU);
+    // Scheduling an instruction may have made pending instructions available.
+    CheckPending = true;
   }
   // checkHazard should prevent scheduling multiple instructions per cycle that
   // exceed the issue width.