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 9006abde1b88114f9ab57f8554993d5b042f2bf4..28acc0fd7b6cec9bec2952a4103fe74191a3c502 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -995,14 +995,9 @@ 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());
 }