LibJS: Clarify Object (base class) construction somewhat

Divide the Object constructor into three variants:

- The regular one (takes an Object& prototype)
- One for use by GlobalObject
- One for use by objects without a prototype (e.g ObjectPrototype)

Libraries/LibJS/Runtime/Uint8ClampedArray.cpp

@@ -39,7 +39,7 @@ Uint8ClampedArray* Uint8ClampedArray::create(GlobalObject& global_object, u32 le
 }
 
 Uint8ClampedArray::Uint8ClampedArray(u32 length, Object& prototype)
-    : Object(&prototype)
+    : Object(prototype)
     , m_length(length)
 {
     define_native_property("length", length_getter, nullptr);