LibJS: Allow object properties called 'async'

Author: https://github.com/davidot
Commit: 32016d3924
Pull-request: https://github.com/SerenityOS/serenity/pull/11088
Issue: https://github.com/SerenityOS/serenity/issues/11078
Reviewed-by: https://github.com/IdanHo
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibJS/Tests/syntax/async-await.js

@@ -18,6 +18,14 @@ describe("parsing object literal async functions", () => {
         expect(`x = { async
                 foo() { } }`).not.toEval();
     });
+
+    test("property on object called async", () => {
+        expect(`x = { async() { } }`).toEval();
+        expect(`x = { async() { await 4; } }`).not.toEval();
+        expect(`x = { async: 3 }`).toEval();
+        expect(`x = { async: await 3, }`).not.toEval();
+    });
+
     test("await expression", () => {
         expect(`x = { foo() { await bar(); } }`).not.toEval();
         expect(`x = { foo() { await; } }`).toEval();