fix bitmask overflow when using slotted components (#4077)

src/compiler/compile/render_dom/Renderer.ts

@@ -220,7 +220,11 @@ export default class Renderer {
 				const i = (value / 31) | 0;
 				const n = 1 << (value % 31);
 
-				if (!bitmask[i]) bitmask[i] = { n: 0, names: [] };
+				if (bitmask.length <= i) {
+					for (let j = bitmask.length; j <= i; j++) {
+						bitmask[j] = { n: 0, names: [] };
+					}
+				}
 
 				bitmask[i].n |= n;
 				bitmask[i].names.push(name);

test/runtime/samples/bitmask-overflow-3/_config.js

@@ -0,0 +1,3 @@
+export default {
+	error: `A is not defined`,
+};

test/runtime/samples/bitmask-overflow-3/main.svelte

@@ -0,0 +1,4 @@
+<script>
+	let x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21, x22, x23, x24, x25, x26, x27, x28, x29, x30, x31;
+</script>
+<A>foo</A>