Assert if InflightSet is not cleared after instruction selecting a BB.

llvm-svn: 28459
diff --git a/llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp b/llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp
index b3ee0d1..e4e99db 100644
--- a/llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp
+++ b/llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp
@@ -160,6 +160,7 @@
   DEBUG(BB->dump());
 
   DAG.setRoot(SelectRoot(DAG.getRoot()));
+  assert(InFlightSet.empty() && "ISel InFlightSet has not been emptied!");
   CodeGenMap.clear();
   HandleMap.clear();
   ReplaceMap.clear();