Fix double-boxing issue when materializing captured objects.

R=verwaest@chromium.org
TEST=mjsunit/compiler/escape-analysis-representation

Review URL: https://codereview.chromium.org/57783003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17468 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/deoptimizer.cc

@@ -1620,10 +1620,10 @@ Handle<Object> Deoptimizer::MaterializeNextHeapObject() {
         Handle<Map>::cast(MaterializeNextValue()), Representation::Tagged());
     switch (map->instance_type()) {
       case HEAP_NUMBER_TYPE: {
-        Handle<HeapNumber> object = isolate_->factory()->NewHeapNumber(0.0);
+        // Reuse the HeapNumber value directly as it is already properly
+        // tagged and skip materializing the HeapNumber explicitly.
+        Handle<Object> object = MaterializeNextValue();
         materialized_objects_->Add(object);
-        Handle<Object> number = MaterializeNextValue();
-        object->set_value(number->Number());
         materialization_value_index_ += kDoubleSize / kPointerSize - 1;
         break;
       }