Merging ContentArray into DescriptorArray

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 11a3df995bd80a44bacbdaa551107593e582baed..b4df6c8caf257e7999c1ad0cbbef70e8c94d9b78 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -1013,14 +1013,9 @@ void NormalizedMapCache::NormalizedMapCacheVerify() {
 void Map::ZapInstanceDescriptors() {
   DescriptorArray* descriptors = instance_descriptors();
   if (descriptors == GetHeap()->empty_descriptor_array()) return;
-  FixedArray* contents = FixedArray::cast(
-      descriptors->get(DescriptorArray::kContentArrayIndex));
   MemsetPointer(descriptors->data_start(),
                 GetHeap()->the_hole_value(),
                 descriptors->length());
-  MemsetPointer(contents->data_start(),
-                GetHeap()->the_hole_value(),
-                contents->length());
 }