[promises] port NewPromiseCapability to TF

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 91f0286e996c2717e11d3afbbd1334826ed1ada9..e7c5d0d691f5358db854baba4cf818553f4c58bd 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -201,6 +201,9 @@ void HeapObject::HeapObjectVerify() {
     case JS_WEAK_SET_TYPE:
       JSWeakSet::cast(this)->JSWeakSetVerify();
       break;
+    case JS_PROMISE_CAPABILITY_TYPE:
+      JSPromiseCapability::cast(this)->JSPromiseCapabilityVerify();
+      break;
     case JS_PROMISE_TYPE:
       JSPromise::cast(this)->JSPromiseVerify();
       break;
@@ -883,6 +886,14 @@ void JSWeakSet::JSWeakSetVerify() {
   CHECK(table()->IsHashTable() || table()->IsUndefined(GetIsolate()));
 }
 
+void JSPromiseCapability::JSPromiseCapabilityVerify() {
+  CHECK(IsJSPromiseCapability());
+  JSObjectVerify();
+  VerifyPointer(promise());
+  VerifyPointer(resolve());
+  VerifyPointer(reject());
+}
+
 void JSPromise::JSPromiseVerify() {
   CHECK(IsJSPromise());
   JSObjectVerify();