Add computed property tests for await blocks

test/runtime/samples/await-then-destruct-computed-props/_config.js

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+export default {
+	async test({ assert, component, target }) {
+		await Promise.resolve();
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+			<p>propA: 3</p>
+			<p>propB: 7</p>
+      <p>num: 3</p>
+			<p>rest: {"prop3":{"prop9":9,"prop10":10}}</p>
+			<p>propZ: 5</p>
+			<p>propY: 6</p>
+			<p>rest: {"propX":7,"propW":8}</p>
+			`
+		);
+
+    await (component.object = Promise.resolve({ prop1: 'one', prop2: 'two', prop3: { prop7: 'seven' }, prop4: { prop10: 'ten' }}));
+    assert.htmlEqual(
+			target.innerHTML,
+			`
+			<p>propA: seven</p>
+			<p>propB: ten</p>
+      <p>num: 5</p>
+			<p>rest: {"prop1":"one","prop2":"two"}</p>
+			<p>propZ: 5</p>
+			<p>propY: 6</p>
+			<p>rest: {"propX":7,"propW":8}</p>
+			`
+		);
+	}
+};

test/runtime/samples/await-then-destruct-computed-props/main.svelte

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+<script>
+  export let object = Promise.resolve({ prop1: { prop4: 2, prop5: 3 }, prop2: { prop6: 5, prop7: 6, prop8: 7 }, prop3: { prop9: 9, prop10: 10 } });
+  const objectReject = Promise.reject({ propZ: 5, propY: 6, propX: 7, propW: 8 });
+
+  let num = 1;
+  const prop = 'prop';
+</script>
+
+{#await object then { [`prop${num++}`]: { [`prop${num + 3}`]: propA }, [`prop${num++}`]: { [`prop${num + 5}`]: propB }, ...rest }}
+	<p>propA: {propA}</p>
+	<p>propB: {propB}</p>
+  <p>num: {num}</p>
+	<p>rest: {JSON.stringify(rest)}</p>
+{/await}
+
+{#await objectReject then value}
+	resolved
+{:catch { [`${prop}Z`]: propZ, [`${prop}Y`]: propY, ...rest }}
+	<p>propZ: {propZ}</p>
+	<p>propY: {propY}</p>
+	<p>rest: {JSON.stringify(rest)}</p>
+{/await}
+