[ownership] Move OME on the stdlib passed the existential specializer/performance constant prop.

Just trying to do this in as small chunks as possible to get better blame
lists.

Author: gottesmm

lib/SILOptimizer/PassManager/PassPipeline.cpp

@@ -308,18 +308,18 @@ void addFunctionPasses(SILPassPipelinePlan &P,
   // Promote stack allocations to values.
   P.addMem2Reg();
 
-  // We earlier eliminated ownership if we are not compiling the stdlib. Now
-  // handle the stdlib functions, re-simplifying, eliminating ARC as we do.
-  P.addCopyPropagation();
-  P.addSemanticARCOpts();
-  P.addNonTransparentFunctionOwnershipModelEliminator();
-
   // Run the existential specializer Pass.
   P.addExistentialSpecializer();
 
   // Cleanup, which is important if the inliner has restarted the pass pipeline.
   P.addPerformanceConstantPropagation();
 
+  // We earlier eliminated ownership if we are not compiling the stdlib. Now
+  // handle the stdlib functions, re-simplifying, eliminating ARC as we do.
+  P.addCopyPropagation();
+  P.addSemanticARCOpts();
+  P.addNonTransparentFunctionOwnershipModelEliminator();
+
   addSimplifyCFGSILCombinePasses(P);
 
   P.addArrayElementPropagation();