[ome] Move OME past MarkUninitializedFixup.

Originally, I was going to update DI at the same time for ownership and to fix
the multiple-projectbox di bug. After a bit messing with it, it is a difficult
change to land due to the size. Instead, I am going to do the ownership update
first and then loop back around and then fix the DI bug.

rdar://31521023

lib/SILOptimizer/PassManager/PassPipeline.cpp

@@ -86,8 +86,8 @@ static void addMandatoryOptPipeline(SILPassPipelinePlan &P,
 
   P.addAllocBoxToStack();
   P.addNoReturnFolding();
-  P.addOwnershipModelEliminator();
   P.addMarkUninitializedFixup();
+  P.addOwnershipModelEliminator();
   P.addDefiniteInitialization();
   P.addMandatoryInlining();
   P.addPredictableMemoryOptimizations();