[elements] Precisely estimate elements size for large-object limits

src/factory.cc

 // Copyright 2014 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/factory.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 119 matching lines @@
 
 
 Handle<FixedArray> Factory::NewFixedArray(int size, PretenureFlag pretenure) {
   DCHECK(0 <= size);
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateFixedArray(size, pretenure),
       FixedArray);
 }
 
+MaybeHandle<FixedArray> Factory::TryNewFixedArray(int size,
+                                                  PretenureFlag pretenure) {
+  DCHECK(0 <= size);
+  AllocationResult allocation =
+      isolate()->heap()->AllocateFixedArray(size, pretenure);
+  Object* array = NULL;
+  if (!allocation.To(&array)) return MaybeHandle<FixedArray>();
+  return Handle<FixedArray>(FixedArray::cast(array), isolate());
+}
 
 Handle<FixedArray> Factory::NewFixedArrayWithHoles(int size,
                                                    PretenureFlag pretenure) {
   DCHECK(0 <= size);
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateFixedArrayWithFiller(size,
                                                       pretenure,
                                                       *the_hole_value()),
       FixedArray);
@@ skipping 2557 matching lines @@
       Handle<JSFixedArrayIterator>::cast(NewJSObjectFromMap(map));
   iterator->set_initial_next(*next);
   iterator->set_array(*array);
   iterator->set_index(0);
   iterator->InObjectPropertyAtPut(JSFixedArrayIterator::kNextIndex, *next);
   return iterator;
 }
 
 }  // namespace internal
 }  // namespace v8