[objects] Relax JSBoundFunction verification.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 36a21351c16a71040474b1383ce41a90d278d173..aba55ecd75cd03f3412cc8237038a4d48f8cce43 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -687,11 +687,14 @@ void JSBoundFunction::JSBoundFunctionVerify() {
   VerifyObjectField(kBoundThisOffset);
   VerifyObjectField(kBoundTargetFunctionOffset);
   VerifyObjectField(kBoundArgumentsOffset);
-  CHECK(bound_target_function()->IsCallable());
   CHECK(IsCallable());
-  CHECK_EQ(IsConstructor(), bound_target_function()->IsConstructor());
-}
 
+  Isolate* const isolate = GetIsolate();
+  if (!raw_bound_target_function()->IsUndefined(isolate)) {
+    CHECK(bound_target_function()->IsCallable());
+    CHECK_EQ(IsConstructor(), bound_target_function()->IsConstructor());
+  }
+}
 
 void JSFunction::JSFunctionVerify() {
   CHECK(IsJSFunction());