Assert correct removal of SUnit in LatencyPriorityQueue

[glasnak]

Summary

The LatencyPriorityQueue doesn't currently check whether the SU being removed really exists in the Queue.
This method fails quietly when SU is not found and removes the last element from the Queue, leading to unexpected behavior.

Unfortunately, this only occurs on our custom target, with the custom scheduler. In our case, when remove() is invoked, it removes the wrong SU at the end of the Queue, which is only discovered later when VerifyScheduledDAG() is invoked and finds that some nodes were not scheduled at all.

As this is only reproducible with a lot of proprietary code, I'm hopeful this assert is straightforward enough to not necessitate a test.

Disclaimer: I am a beginner and this is my first patch. All comments, complaints and criticisms are very welcome.

[bkramer]

lg. Do you have commit access?

[glasnak]

No, I don't think I have, would you commit it please?

lib/CodeGen/LatencyPriorityQueue.cpp

 void LatencyPriorityQueue::remove(SUnit *SU) {
   assert(!Queue.empty() && "Queue is empty!");
   std::vector<SUnit *>::iterator I = find(Queue, SU);
+  assert(I != Queue.end() && "Queue doesn't contain the SU being removed!");
   if (I != std::prev(Queue.end()))
     std::swap(*I, Queue.back());
   Queue.pop_back();