VM: Improve polymorphic check-class in optimized code.

runtime/vm/flow_graph_inliner.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_inliner.h"
 
 #include "vm/block_scheduler.h"
 #include "vm/compiler.h"
 #include "vm/flags.h"
 #include "vm/flow_graph.h"
@@ skipping 1674 matching lines @@
       push->ReplaceUsesWith(push->value()->definition());
       push->RemoveFromGraph();
     }
   }
   return entry;
 }
 
 
 void PolymorphicInliner::Inline() {
   // Consider the polymorphic variants in order by frequency.
-  FlowGraphCompiler::SortICDataByCount(call_->ic_data(), &variants_);
+  FlowGraphCompiler::SortICDataByCount(call_->ic_data(),
+                                       &variants_,
+                                       /* drop_smi = */ false);
   for (intptr_t var_idx = 0; var_idx < variants_.length(); ++var_idx) {
     const Function& target = *variants_[var_idx].target;
     const intptr_t receiver_cid = variants_[var_idx].cid;
 
     // First check if this is the same target as an earlier inlined variant.
     if (CheckInlinedDuplicate(target)) {
       inlined_variants_.Add(variants_[var_idx]);
       continue;
     }
 
@@ skipping 122 matching lines @@
 
 
 intptr_t FlowGraphInliner::NextInlineId(const Function& function) {
   const intptr_t id = inline_id_to_function_->length();
   inline_id_to_function_->Add(&function);
   return id;
 }
 
 
 }  // namespace dart