Add test case for binding in each block

test/runtime/samples/binding-this-component-each-block/Foo.svelte

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+<div>foo</div>

test/runtime/samples/binding-this-component-each-block/_config.js

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+export default {
+	skip_if_ssr: true,
+
+	html: `
+		<div>foo</div>
+		<div>0 has foo: true</div>
+		<div>foo</div>
+		<div>1 has foo: true</div>
+		<div>foo</div>
+		<div>2 has foo: true</div>
+	`
+};

test/runtime/samples/binding-this-component-each-block/main.svelte

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+<script>
+	import Foo from './Foo.svelte';
+	export let foo = [];
+</script>
+
+{#each Array(3) as _, i}
+	<Foo bind:this={foo[i]}/>
+	<div>
+		{i} has foo: {!!foo[i]}
+	</div>
+{/each}