wip(compiler): adjust renderSlot() signature

packages/runtime-core/src/helpers/renderSlot.ts

@@ -8,12 +8,14 @@ import {
 } from '../vnode'
 
 export function renderSlot(
-  slot: Slot | undefined,
+  slots: Record<string, Slot>,
+  key: string,
   props: any = {},
   // this is not a user-facing function, so the fallback is always generated by
   // the compiler and gurunteed to be an array
   fallback?: VNodeChildren
 ): VNode {
+  const slot = slots[key]
   return (
     openBlock(),
     createBlock(