[runtime] Allocate space for computed property names

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 65f12cadfb318271696cc9c192ecfee5a0a0e7db..ec64e15e8f6669f8c8f5798d3eb4bc9642263f3f 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -195,6 +195,8 @@ bool HeapObject::IsFixedArray() const {
          instance_type == TRANSITION_ARRAY_TYPE;
 }
 
+bool HeapObject::IsBoilerplateDescription() const { return IsFixedArray(); }
+
 // External objects are not extensible, so the map check is enough.
 bool HeapObject::IsExternal() const {
   return map() == GetHeap()->external_map();
@@ -609,6 +611,7 @@ bool Object::IsMinusZero() const {
 
 CAST_ACCESSOR(AbstractCode)
 CAST_ACCESSOR(ArrayList)
+CAST_ACCESSOR(BoilerplateDescription)
 CAST_ACCESSOR(Bool16x8)
 CAST_ACCESSOR(Bool32x4)
 CAST_ACCESSOR(Bool8x16)