LibJS: Store NonnullGCPtr<Symbol> values in m_global_symbol_registry

Userland/Libraries/LibJS/Runtime/VM.cpp

@@ -237,8 +237,8 @@ Symbol* VM::get_global_symbol(DeprecatedString const& description)
     if (result.has_value())
         return result.value();
 
-    auto new_global_symbol = js_symbol(*this, description, true);
-    m_global_symbol_registry.set(description, new_global_symbol);
+    auto* new_global_symbol = js_symbol(*this, description, true);
+    m_global_symbol_registry.set(description, *new_global_symbol);
     return new_global_symbol;
 }
 

Userland/Libraries/LibJS/Runtime/VM.h

@@ -265,7 +265,7 @@ private:
     StackInfo m_stack_info;
 
     // GlobalSymbolRegistry, https://tc39.es/ecma262/#table-globalsymbolregistry-record-fields
-    HashMap<DeprecatedString, Symbol*> m_global_symbol_registry;
+    HashMap<DeprecatedString, NonnullGCPtr<Symbol>> m_global_symbol_registry;
 
     Vector<Function<ThrowCompletionOr<Value>()>> m_promise_jobs;