[promises] Refactor debug code

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 67d2ac7a362c0b0aabe635e320a5871b79305cb8..98b1df2f8a4b109447c734e2fbcd9b0cf9641883 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -1021,8 +1021,8 @@ void PromiseResolveThenableJobInfo::PromiseResolveThenableJobInfoVerify() {
   CHECK(then()->IsJSReceiver());
   CHECK(resolve()->IsJSFunction());
   CHECK(reject()->IsJSFunction());
-  CHECK(debug_id()->IsNumber() || debug_id()->IsUndefined(isolate));
-  CHECK(debug_name()->IsString() || debug_name()->IsUndefined(isolate));
+  VerifySmiField(kDebugIdOffset);
+  VerifySmiField(kDebugNameOffset);
   CHECK(context()->IsContext());
 }
 
@@ -1041,8 +1041,8 @@ void PromiseReactionJobInfo::PromiseReactionJobInfoVerify() {
   CHECK(deferred_on_reject()->IsUndefined(isolate) ||
         deferred_on_reject()->IsCallable() ||
         deferred_on_reject()->IsFixedArray());
-  CHECK(debug_id()->IsNumber() || debug_id()->IsUndefined(isolate));
-  CHECK(debug_name()->IsString() || debug_name()->IsUndefined(isolate));
+  VerifySmiField(kDebugIdOffset);
+  VerifySmiField(kDebugNameOffset);
   CHECK(context()->IsContext());
 }