LibJSGCVerifier: Support marking GCPtr members as raw references

This lets us avoid false positives when a GCPtr-wrapped member is only
a weak reference which is automatically updated by the GC when the
member's gc state is updated.

Userland/Libraries/LibJS/Runtime/WeakSet.h

@@ -32,7 +32,7 @@ public:
 private:
     explicit WeakSet(Object& prototype);
 
-    HashTable<GCPtr<Cell>> m_values; // This stores Cell pointers instead of Object pointers to aide with sweeping
+    HashTable<RawGCPtr<Cell>> m_values; // This stores Cell pointers instead of Object pointers to aide with sweeping
 };
 
 }