[explicit-resource-management] Add test for async generator body

This cl adds a test for having `await using` in the async
generator function body.

Bug: 42203814
Change-Id: I30c0d2fe354a3047f67a4a71f7c6472c3d832bbf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/5867651
Commit-Queue: Rezvan Mahdavi Hezaveh <rezvan@chromium.org>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#96146}

test/staging/explicit-resource-management/await-using-in-async-generator-body.js

@@ -0,0 +1,33 @@
+// Copyright (C) 2024 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Test if disposed methods are called correctly in generator body.
+includes: [asyncHelpers.js, compareArray.js]
+flags: [async]
+features: [explicit-resource-management]
+---*/
+
+asyncTest(async function() {
+    let generatorBodyValues = [];
+
+    async function* gen() {
+      await using x = {
+        value: 1,
+        [Symbol.asyncDispose]() {
+          generatorBodyValues.push(42);
+        }
+      };
+      yield x;
+    }
+
+    async function TestUsingInGeneratorBody() {
+      let iter = gen();
+      await iter.next();
+      assert.compareArray(generatorBodyValues, []);
+      iter.next().then((result) => assert.sameValue(result.value, 1));
+      generatorBodyValues.push(43);
+    }
+    await TestUsingInGeneratorBody();
+    assert.compareArray(generatorBodyValues, [42, 43]);
+  });