[promsies] Verify status field is a smi

src/objects-debug.cc

 // 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.
 
 #include "src/objects.h"
 
 #include "src/bootstrapper.h"
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/field-type.h"
@@ skipping 869 matching lines @@
   CHECK(IsJSWeakSet());
   JSObjectVerify();
   VerifyHeapPointer(table());
   CHECK(table()->IsHashTable() || table()->IsUndefined(GetIsolate()));
 }
 
 void JSPromise::JSPromiseVerify() {
   CHECK(IsJSPromise());
   JSObjectVerify();
   Isolate* isolate = GetIsolate();
+  VerifySmiField(kStatusOffset);
   CHECK(result()->IsUndefined(isolate) || result()->IsObject());
   CHECK(deferred_promise()->IsUndefined(isolate) ||
         deferred_promise()->IsJSReceiver() ||
         deferred_promise()->IsFixedArray());
   CHECK(deferred_on_resolve()->IsUndefined(isolate) ||
         deferred_on_resolve()->IsCallable() ||
         deferred_on_resolve()->IsFixedArray());
   CHECK(deferred_on_reject()->IsUndefined(isolate) ||
         deferred_on_reject()->IsCallable() ||
         deferred_on_reject()->IsFixedArray());
@@ skipping 644 matching lines @@
 
   // Both are done at the same time.
   CHECK_EQ(new_it.done(), old_it.done());
 }
 
 
 #endif  // DEBUG
 
 }  // namespace internal
 }  // namespace v8