Fix missing case for JS_PROMISE_TYPE for header size.

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 2102 matching lines @@
     case JS_SET_ITERATOR_TYPE:
       return JSSetIterator::kSize;
     case JS_MAP_ITERATOR_TYPE:
       return JSMapIterator::kSize;
     case JS_ITERATOR_RESULT_TYPE:
       return JSIteratorResult::kSize;
     case JS_WEAK_MAP_TYPE:
       return JSWeakMap::kSize;
     case JS_WEAK_SET_TYPE:
       return JSWeakSet::kSize;
+    case JS_PROMISE_TYPE:
+      return JSObject::kHeaderSize;
     case JS_REGEXP_TYPE:
       return JSRegExp::kSize;
     case JS_CONTEXT_EXTENSION_OBJECT_TYPE:
       return JSObject::kHeaderSize;
     case JS_MESSAGE_OBJECT_TYPE:
       return JSMessageObject::kSize;
     default:
       UNREACHABLE();
       return 0;
   }
@@ skipping 5749 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_