Inobject slack tracking is done on a per-closure basis instead of per-shared info basis.

src/compiler.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #include "compiler.h"
 
 #include "bootstrapper.h"
 #include "codegen.h"
@@ skipping 490 matching lines @@
     isolate()->GetHStatistics()->IncrementSubtotals(time_taken_to_create_graph_,
                                                     time_taken_to_optimize_,
                                                     time_taken_to_codegen_);
   }
 }
 
 
 // Sets the expected number of properties based on estimate from compiler.
 void SetExpectedNofPropertiesFromEstimate(Handle<SharedFunctionInfo> shared,
                                           int estimate) {
-  // See the comment in SetExpectedNofProperties.
-  if (shared->live_objects_may_exist()) return;
-
   // If no properties are added in the constructor, they are more likely
   // to be added later.
   if (estimate == 0) estimate = 2;
 
   // TODO(yangguo): check whether those heuristics are still up-to-date.
   // We do not shrink objects that go into a snapshot (yet), so we adjust
   // the estimate conservatively.
   if (Serializer::enabled(shared->GetIsolate())) {
     estimate += 2;
   } else if (FLAG_clever_optimizations) {
@@ skipping 761 matching lines @@
   AllowHandleDereference allow_deref;
   bool tracing_on = info()->IsStub()
       ? FLAG_trace_hydrogen_stubs
       : (FLAG_trace_hydrogen &&
          info()->closure()->PassesFilter(FLAG_trace_hydrogen_filter));
   return (tracing_on &&
       OS::StrChr(const_cast<char*>(FLAG_trace_phase), name_[0]) != NULL);
 }
 
 } }  // namespace v8::internal