async_hooks: don't read resource if ALS is disabled

Only call executionAsyncResource() in getStore() if the ALS instance is
enabled because the resource is not needed otherwise.

PR-URL: #34617
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

lib/async_hooks.js

@@ -277,8 +277,8 @@ class AsyncLocalStorage {
   }
 
   getStore() {
-    const resource = executionAsyncResource();
     if (this.enabled) {
+      const resource = executionAsyncResource();
       return resource[this.kResourceStore];
     }
   }