fix(compiler-core): change node hoisting to caching per instance

[yyx990803]

close #5256
close #9219
close #10959

Node hoisting has created various issues in the past. Most notably in some cases it can cause the first owner instance to be kept in memory forever (#5256).

The original intention of node hoisting is so that we can (1) reuse the same nodes and avoid re-creating them on each update, and (2) provide a fast path for runtime diffing.

Notably this has always been flawed because Vue's vdom algorithm requires attaching the actual DOM to the VNode, so we are cloning a copy of each hoisted node for each component instance. This is no different from caching-per-instance but leads to the memory issue described above.

With this PR:

• Cached nodes are now stored per instance and garbage collected when instance unmounts.
• Cached nodes are lazy-created on first render (addresses the same problem perf: lazy init hoisted vnodes #10959 is attempting to fix)
• Some logic around scopeId handling for hoisted nodes has been removed because it is no longer needed
• Caching logic has also been improved to handle arrays returned by slots.

Given the template:

<div>
  <div>hello</div>
  <div>hello</div>
</div>

Before:

const _hoisted_1 = /*#__PURE__*/_createElementVNode("div", null, "hello", -1 /* HOISTED */)
const _hoisted_2 = /*#__PURE__*/_createElementVNode("div", null, "hello", -1 /* HOISTED */)
const _hoisted_3 = [
  _hoisted_1,
  _hoisted_2
]
function render(_ctx, _cache) {
  return (_openBlock(), _createElementBlock("div", null, [..._hoisted_3]))
}

After:

function render(_ctx, _cache) {
  return (_openBlock(), _createElementBlock("div", null, _cache[0] || (_cache[0] = [
    _createElementVNode("div", null, "hello", -1 /* CACHED */),
    _createElementVNode("div", null, "hello", -1 /* CACHED */)
  ])))
}

The generated code will look quite different after this change (see the many snapshot changes), but should be fully backwards compatible. That said this is some significant change to codegen so we are putting it in a minor to give it some alpha/beta testing time.

Other Internal Changes

• hoistStatic.ts file renamed to cacheStatic.ts. The public option hoistStatic is preserved for backwards compatibility.
• PatchFlags.HOISTED -> PatchFlags.CACHED
• stringifyStatic logic has undergone some big changes but should remain compatible.
• RootNode.cached and TransformContext.cached are now arrays of cached nodes (null in the case of v-memo)

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	94.3 kB (+3.29 kB)	35.6 kB (+998 B)	32.1 kB (+872 B)
vue.global.prod.js	152 kB (+4.28 kB)	55.1 kB (+1.32 kB)	49.2 kB (+1.15 kB)

Usages

Name	Size	Gzip	Brotli
createApp	54.1 kB (+3.17 kB)	20.9 kB (+996 B)	19 kB (+844 B)
createSSRApp	57.5 kB (+3.17 kB)	22.3 kB (+980 B)	20.2 kB (+830 B)
defineCustomElement	56.4 kB (+3.17 kB)	21.7 kB (+1 kB)	19.7 kB (+808 B)
overall	68 kB (+3.26 kB)	25.9 kB (+973 B)	23.5 kB (+834 B)

[yyx990803]

/ecosystem-ci run

[yyx990803]

/cc @huang-julien

Nuxt has one test case failing here https://github.com/vuejs/ecosystem-ci/actions/runs/9365657120/job/25781312030#step:7:1279 because there are no longer pushScopeId calls for hoisted nodes. I think line 118 and 121 can be removed.