LibJS: Convert Heap::allocate{,_without_realm}() to NonnullGCPtr

Author: https://github.com/linusg
Commit: 22089436ed
Pull-request: https://github.com/SerenityOS/serenity/pull/16498
Reviewed-by: https://github.com/trflynn89 ✅

Userland/Libraries/LibJS/Runtime/WeakMap.cpp

@@ -10,7 +10,7 @@ namespace JS {
 
 NonnullGCPtr<WeakMap> WeakMap::create(Realm& realm)
 {
-    return *realm.heap().allocate<WeakMap>(realm, *realm.intrinsics().weak_map_prototype());
+    return realm.heap().allocate<WeakMap>(realm, *realm.intrinsics().weak_map_prototype());
 }
 
 WeakMap::WeakMap(Object& prototype)