Reduce number of times a deopt-id is computed.

runtime/vm/code_descriptors.cc

 // Copyright (c) 2012, 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/code_descriptors.h"
 
 namespace dart {
 
 void DescriptorList::AddDescriptor(RawPcDescriptors::Kind kind,
                                    intptr_t pc_offset,
                                    intptr_t deopt_id,
                                    intptr_t token_index,
                                    intptr_t try_index) {
+  ASSERT((kind == RawPcDescriptors::kRuntimeCall) ||
+         (kind == RawPcDescriptors::kOther) ||
+         (deopt_id != Isolate::kNoDeoptId));

[Ivan Posva, 2014/09/26 16:27:08]

Separate CL: Move kNoDeoptId somewhere more sensible.

   struct PcDesc data;
   data.pc_offset = pc_offset;
   data.kind = kind;
   data.deopt_id = deopt_id;
   data.SetTokenPos(token_index);
   data.try_index = try_index;
   list_.Add(data);
   if (try_index >= 0) {
     has_try_index_ = true;
   }
@@ skipping 51 matching lines @@
 }
 
 
 RawStackmap* StackmapTableBuilder::MapAt(intptr_t index) const {
   Stackmap& map = Stackmap::Handle();
   map ^= list_.At(index);
   return map.raw();
 }
 
 }  // namespace dart