[Flight] Forward early debug info for lazy chunks

[lubieowoce]

Currently, when we're re-encoding a lazy chunk that came from a flight stream, we wait for the chunk to resolve, and then forward the debug info. This unnecessarily delays debug info that's already available while the chunk is still pending, like stack info. This PR attempts to make it so that we emit whatever debug info we have before initializing the lazy chunk (which may suspend), and then emit the rest after.

When a debug info array is partially emitted, we save the entries we already emitted in a WeakSet request.earlyDebugInfoEntries. That way, when we emit it again later, we know which entries to skip.

Notably, we need to track individual entries, because they might get transferred from the lazy chunk onto the inner element (i.e. moved to a different array):

react/packages/react-client/src/ReactFlightClient.js

Lines 1275 to 1291 in b546603

	// If the lazy node is initialized, we move its debug info to the inner
	// value.
	if (lazyNode._payload.status === INITIALIZED && lazyNode._debugInfo) {
	const debugInfo = lazyNode._debugInfo.splice(0);
	if (element._debugInfo) {
	// $FlowFixMe[method-unbinding]
	element._debugInfo.unshift.apply(element._debugInfo, debugInfo);
	} else {
	Object.defineProperty(element, '_debugInfo', {
	configurable: false,
	enumerable: false,
	writable: true,
	value: debugInfo,
	});
	}
	}
	}

(Originally, i had a WeakMap that tracked a "emitted entries count" per debug info array, but this didn't account for moving entries into a different array)

Most debug infos are not partially emitted -- we currently only do this for lazy elements -- so to avoid the overhead of tracking each entry we only do this if it's emitted using forwardDebugInfoOnce.

[react-sizebot]

Comparing: b546603...49046be

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.84 kB	6.84 kB	=	1.88 kB	1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	608.67 kB	608.67 kB	=	107.63 kB	107.63 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.84 kB	6.84 kB	=	1.88 kB	1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	674.60 kB	674.60 kB	=	118.58 kB	118.58 kB
facebook-www/ReactDOM-prod.classic.js	=	694.04 kB	694.04 kB	=	122.01 kB	122.01 kB
facebook-www/ReactDOM-prod.modern.js	=	684.43 kB	684.43 kB	=	120.40 kB	120.40 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable-semver/react-server/cjs/react-server-flight.development.js	+0.56%	143.70 kB	144.50 kB	+0.64%	25.64 kB	25.81 kB
oss-stable/react-server/cjs/react-server-flight.development.js	+0.56%	143.70 kB	144.50 kB	+0.64%	25.64 kB	25.81 kB
oss-experimental/react-server/cjs/react-server-flight.development.js	+0.55%	145.79 kB	146.59 kB	+0.74%	26.10 kB	26.29 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-server.browser.development.js	+0.41%	196.96 kB	197.76 kB	+0.50%	35.59 kB	35.77 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-server.browser.development.js	+0.41%	196.96 kB	197.76 kB	+0.50%	35.59 kB	35.77 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-server.browser.development.js	+0.40%	199.07 kB	199.87 kB	+0.44%	36.03 kB	36.19 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-server.edge.development.js	+0.40%	200.66 kB	201.46 kB	+0.45%	36.09 kB	36.25 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-server.edge.development.js	+0.40%	200.66 kB	201.46 kB	+0.45%	36.09 kB	36.25 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-server.edge.development.js	+0.40%	202.75 kB	203.55 kB	+0.43%	36.52 kB	36.68 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.browser.development.js	+0.39%	204.75 kB	205.55 kB	+0.45%	36.90 kB	37.07 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.browser.development.js	+0.39%	204.75 kB	205.55 kB	+0.45%	36.90 kB	37.07 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-server.browser.development.js	+0.39%	205.22 kB	206.02 kB	+0.45%	37.01 kB	37.18 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-server.browser.development.js	+0.39%	205.22 kB	206.02 kB	+0.45%	37.01 kB	37.18 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.browser.development.js	+0.39%	206.85 kB	207.65 kB	+0.40%	37.34 kB	37.49 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-server.browser.development.js	+0.39%	207.33 kB	208.13 kB	+0.41%	37.45 kB	37.60 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js	+0.38%	208.48 kB	209.28 kB	+0.43%	37.40 kB	37.55 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js	+0.38%	208.48 kB	209.28 kB	+0.43%	37.40 kB	37.55 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.edge.development.js	+0.38%	208.48 kB	209.28 kB	+0.42%	37.40 kB	37.56 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.edge.development.js	+0.38%	208.48 kB	209.28 kB	+0.42%	37.40 kB	37.56 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js	+0.38%	210.57 kB	211.37 kB	+0.42%	37.82 kB	37.98 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.edge.development.js	+0.38%	210.57 kB	211.37 kB	+0.40%	37.83 kB	37.98 kB
oss-stable-semver/react-server-dom-esm/cjs/react-server-dom-esm-server.node.development.js	+0.37%	223.52 kB	224.35 kB	+0.36%	40.47 kB	40.62 kB
oss-stable/react-server-dom-esm/cjs/react-server-dom-esm-server.node.development.js	+0.37%	223.52 kB	224.35 kB	+0.36%	40.47 kB	40.62 kB
oss-experimental/react-server-dom-esm/cjs/react-server-dom-esm-server.node.development.js	+0.36%	225.61 kB	226.44 kB	+0.37%	40.92 kB	41.08 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-server.node.development.js	+0.36%	230.04 kB	230.86 kB	+0.37%	41.07 kB	41.22 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-server.node.development.js	+0.36%	230.04 kB	230.86 kB	+0.37%	41.07 kB	41.22 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-server.node.development.js	+0.35%	232.13 kB	232.95 kB	+0.36%	41.53 kB	41.68 kB
oss-stable-semver/react-server-dom-unbundled/cjs/react-server-dom-unbundled-server.node.development.js	+0.35%	236.70 kB	237.52 kB	+0.39%	42.13 kB	42.29 kB
oss-stable/react-server-dom-unbundled/cjs/react-server-dom-unbundled-server.node.development.js	+0.35%	236.70 kB	237.52 kB	+0.39%	42.13 kB	42.29 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-server.node.development.js	+0.35%	237.90 kB	238.72 kB	+0.37%	42.44 kB	42.60 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-server.node.development.js	+0.35%	237.90 kB	238.72 kB	+0.37%	42.44 kB	42.60 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.node.development.js	+0.35%	237.95 kB	238.77 kB	+0.37%	42.43 kB	42.58 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.node.development.js	+0.35%	237.95 kB	238.77 kB	+0.37%	42.43 kB	42.58 kB
oss-experimental/react-server-dom-unbundled/cjs/react-server-dom-unbundled-server.node.development.js	+0.34%	238.79 kB	239.61 kB	+0.37%	42.60 kB	42.76 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-server.node.development.js	+0.34%	239.99 kB	240.81 kB	+0.35%	42.91 kB	43.06 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.node.development.js	+0.34%	240.04 kB	240.86 kB	+0.35%	42.91 kB	43.06 kB

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