Ensure that we don't mark weak heap references in the constant pool array.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index b3f23e65e3d2998a43dbd04b21213dde5ebf2e4e..2ad03eb9a8a7b8df4e6990919e661522e5591a81 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -2218,12 +2218,18 @@ bool FixedDoubleArray::is_the_hole(int index) {
 }
 
 
-SMI_ACCESSORS(
-    ConstantPoolArray, first_code_ptr_index, kFirstCodePointerIndexOffset)
-SMI_ACCESSORS(
-    ConstantPoolArray, first_heap_ptr_index, kFirstHeapPointerIndexOffset)
-SMI_ACCESSORS(
-    ConstantPoolArray, first_int32_index, kFirstInt32IndexOffset)
+void ConstantPoolArray::set_weak_object_state(
+      ConstantPoolArray::WeakObjectState state) {
+  int old_layout_field = READ_INT_FIELD(this, kArrayLayoutOffset);
+  int new_layout_field = WeakObjectStateField::update(old_layout_field, state);
+  WRITE_INT_FIELD(this, kArrayLayoutOffset, new_layout_field);
+}
+
+
+ConstantPoolArray::WeakObjectState ConstantPoolArray::get_weak_object_state() {
+  int layout_field = READ_INT_FIELD(this, kArrayLayoutOffset);
+  return WeakObjectStateField::decode(layout_field);
+}
 
 
 int ConstantPoolArray::first_int64_index() {
@@ -2231,6 +2237,27 @@ int ConstantPoolArray::first_int64_index() {
 }
 
 
+int ConstantPoolArray::first_code_ptr_index() {
+  int layout_field = READ_INT_FIELD(this, kArrayLayoutOffset);
+  return first_int64_index() +
+      NumberOfInt64EntriesField::decode(layout_field);
+}
+
+
+int ConstantPoolArray::first_heap_ptr_index() {
+  int layout_field = READ_INT_FIELD(this, kArrayLayoutOffset);
+  return first_code_ptr_index() +
+      NumberOfCodePtrEntriesField::decode(layout_field);
+}
+
+
+int ConstantPoolArray::first_int32_index() {
+  int layout_field = READ_INT_FIELD(this, kArrayLayoutOffset);
+  return first_heap_ptr_index() +
+      NumberOfHeapPtrEntriesField::decode(layout_field);
+}
+
+
 int ConstantPoolArray::count_of_int64_entries() {
   return first_code_ptr_index();
 }
@@ -2251,18 +2278,20 @@ int ConstantPoolArray::count_of_int32_entries() {
 }
 
 
-void ConstantPoolArray::SetEntryCounts(int number_of_int64_entries,
-                                       int number_of_code_ptr_entries,
-                                       int number_of_heap_ptr_entries,
-                                       int number_of_int32_entries) {
-  int current_index = number_of_int64_entries;
-  set_first_code_ptr_index(current_index);
-  current_index += number_of_code_ptr_entries;
-  set_first_heap_ptr_index(current_index);
-  current_index += number_of_heap_ptr_entries;
-  set_first_int32_index(current_index);
-  current_index += number_of_int32_entries;
-  set_length(current_index);
+void ConstantPoolArray::Init(int number_of_int64_entries,
+                             int number_of_code_ptr_entries,
+                             int number_of_heap_ptr_entries,
+                             int number_of_int32_entries) {
+  set_length(number_of_int64_entries +
+             number_of_code_ptr_entries +
+             number_of_heap_ptr_entries +
+             number_of_int32_entries);
+  int layout_field =
+      NumberOfInt64EntriesField::encode(number_of_int64_entries) |
+      NumberOfCodePtrEntriesField::encode(number_of_code_ptr_entries) |
+      NumberOfHeapPtrEntriesField::encode(number_of_heap_ptr_entries) |
+      WeakObjectStateField::encode(NO_WEAK_OBJECTS);
+  WRITE_INT_FIELD(this, kArrayLayoutOffset, layout_field);
 }
 
 
@@ -4598,7 +4627,6 @@ Object* Code::GetObjectFromEntryAddress(Address location_of_address) {
 
 
 bool Code::IsWeakObjectInOptimizedCode(Object* object) {
-  ASSERT(is_optimized_code());
   if (object->IsMap()) {
     return Map::cast(object)->CanTransition() &&
            FLAG_collect_maps &&