[objects] Relax JSBoundFunction verification.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 2ede42a9921d482893f4177c03e612bba0cf842b..1a4f7552cccc2ac2091880caa57ade99027d6310 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4947,6 +4947,7 @@ class Module : public Struct {
 class JSBoundFunction : public JSObject {
  public:
   // [bound_target_function]: The wrapped function object.
+  inline Object* raw_bound_target_function() const;
   DECL_ACCESSORS(bound_target_function, JSReceiver)
 
   // [bound_this]: The value that is always passed as the this value when