add test

test/runtime/samples/array-literal-spread-deopt/_config.js

@@ -0,0 +1,3 @@
+export default {
+	html: `<div>a</div> <div>b</div> <div>c</div>`
+};

test/runtime/samples/array-literal-spread-deopt/main.svelte

@@ -0,0 +1,7 @@
+<script>
+	const foo = ['a', 'b', 'c'];
+</script>
+
+{#each [...foo] as item}
+	<div>{item}</div>
+{/each}