Count closures using the feedback vector cell map, specialize if count==1.

src/debug/liveedit.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 "src/debug/liveedit.h"
 
 #include "src/ast/scopes.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/compiler.h"
@@ skipping 743 matching lines @@
     int new_literal_count = compile_info_wrapper->GetLiteralCount();
 
     // When feedback metadata changes, we have to create new array instances.
     // Since we cannot create instances when iterating heap, we should first
     // collect all functions and fix their literal arrays.
     Handle<FixedArray> function_instances =
         CollectJSFunctions(shared_info, isolate);
 
     for (int i = 0; i < function_instances->length(); i++) {
       Handle<JSFunction> fun(JSFunction::cast(function_instances->get(i)));
-      fun->set_feedback_vector_cell(isolate->heap()->undefined_cell());
+      Handle<Cell> new_cell = isolate->factory()->NewManyClosuresCell(
+          isolate->factory()->undefined_value());
+      fun->set_feedback_vector_cell(*new_cell);
       // Only create feedback vectors if we already have the metadata.
       if (shared_info->is_compiled()) JSFunction::EnsureLiterals(fun);
     }
 
     shared_info->set_num_literals(new_literal_count);
   }
 
  private:
   // Iterates all function instances in the HEAP that refers to the
   // provided shared_info.
@@ skipping 871 matching lines @@
     scope_info_length++;
 
     current_scope = current_scope->outer_scope();
   }
 
   return scope_info_list;
 }
 
 }  // namespace internal
 }  // namespace v8