Revert "Clear memoizedState on unmount of fiber to avoid memory leak"

[trueadm]

Reverts #14218

[sizebot]

ReactDOM: size: -0.2%, gzip: -0.1%

Details of bundled changes.

Comparing: 9b2fb24...9a91f12

react-dom

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-dom.development.js	-0.1%	-0.1%	716.6 KB	716.22 KB	165.87 KB	165.78 KB	UMD_DEV
react-dom.production.min.js	-0.2%	-0.1%	97.85 KB	97.66 KB	31.82 KB	31.8 KB	UMD_PROD
react-dom.profiling.min.js	-0.2%	-0.0%	100.75 KB	100.56 KB	32.51 KB	32.5 KB	UMD_PROFILING
react-dom.development.js	-0.1%	-0.1%	711.91 KB	711.53 KB	164.49 KB	164.4 KB	NODE_DEV
react-dom.production.min.js	-0.2%	-0.1%	97.84 KB	97.65 KB	31.35 KB	31.31 KB	NODE_PROD
react-dom.profiling.min.js	-0.2%	-0.1%	100.84 KB	100.65 KB	31.96 KB	31.93 KB	NODE_PROFILING
ReactDOM-dev.js	-0.1%	-0.0%	733.1 KB	732.72 KB	165.62 KB	165.55 KB	FB_WWW_DEV
ReactDOM-prod.js	-0.1%	-0.1%	310.04 KB	309.63 KB	57.1 KB	57.06 KB	FB_WWW_PROD
ReactDOM-profiling.js	-0.1%	-0.1%	316.91 KB	316.53 KB	58.51 KB	58.46 KB	FB_WWW_PROFILING

react-art

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-art.development.js	-0.1%	-0.1%	496.99 KB	496.63 KB	109.69 KB	109.61 KB	UMD_DEV
react-art.production.min.js	-0.2%	-0.2%	90.01 KB	89.83 KB	27.65 KB	27.61 KB	UMD_PROD
react-art.development.js	-0.1%	-0.1%	428.79 KB	428.41 KB	92.66 KB	92.56 KB	NODE_DEV
react-art.production.min.js	-0.3%	-0.2%	55 KB	54.81 KB	16.94 KB	16.9 KB	NODE_PROD
ReactART-dev.js	-0.1%	-0.1%	435.82 KB	435.44 KB	91.56 KB	91.48 KB	FB_WWW_DEV
ReactART-prod.js	-0.2%	-0.1%	183.82 KB	183.41 KB	31.39 KB	31.35 KB	FB_WWW_PROD

react-native-renderer

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
ReactNativeRenderer-dev.js	-0.1%	-0.1%	560.93 KB	560.55 KB	122.25 KB	122.18 KB	RN_FB_DEV
ReactNativeRenderer-prod.js	-0.2%	-0.1%	239.25 KB	238.84 KB	42.08 KB	42.04 KB	RN_FB_PROD
ReactNativeRenderer-profiling.js	-0.2%	-0.1%	245.18 KB	244.81 KB	43.44 KB	43.39 KB	RN_FB_PROFILING
ReactNativeRenderer-dev.js	-0.1%	-0.1%	560.63 KB	560.25 KB	122.16 KB	122.08 KB	RN_OSS_DEV
ReactNativeRenderer-prod.js	-0.2%	-0.1%	224.69 KB	224.28 KB	39.01 KB	38.96 KB	RN_OSS_PROD
ReactNativeRenderer-profiling.js	-0.2%	-0.1%	230.38 KB	230 KB	40.36 KB	40.31 KB	RN_OSS_PROFILING
ReactFabric-dev.js	-0.1%	-0.1%	551.25 KB	550.87 KB	119.77 KB	119.69 KB	RN_FB_DEV
ReactFabric-prod.js	-0.2%	-0.1%	218.66 KB	218.27 KB	37.66 KB	37.63 KB	RN_FB_PROD
ReactFabric-profiling.js	-0.2%	-0.1%	223.4 KB	223.05 KB	39.08 KB	39.04 KB	RN_FB_PROFILING
ReactFabric-dev.js	-0.1%	-0.1%	551.28 KB	550.9 KB	119.79 KB	119.71 KB	RN_OSS_DEV
ReactFabric-prod.js	-0.2%	-0.1%	218.69 KB	218.31 KB	37.68 KB	37.64 KB	RN_OSS_PROD
ReactFabric-profiling.js	-0.2%	-0.1%	223.44 KB	223.09 KB	39.1 KB	39.05 KB	RN_OSS_PROFILING

react-test-renderer

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-test-renderer.development.js	-0.1%	-0.1%	441.45 KB	441.07 KB	95.35 KB	95.26 KB	UMD_DEV
react-test-renderer.production.min.js	-0.3%	-0.2%	56.22 KB	56.03 KB	17.22 KB	17.19 KB	UMD_PROD
react-test-renderer.development.js	-0.1%	-0.1%	436.67 KB	436.29 KB	94.2 KB	94.11 KB	NODE_DEV
react-test-renderer.production.min.js	-0.3%	-0.1%	55.89 KB	55.7 KB	17.07 KB	17.05 KB	NODE_PROD
ReactTestRenderer-dev.js	-0.1%	-0.1%	443.8 KB	443.42 KB	93.37 KB	93.29 KB	FB_WWW_DEV

react-reconciler

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-reconciler.development.js	-0.1%	-0.1%	426.63 KB	426.25 KB	91.17 KB	91.07 KB	NODE_DEV
react-reconciler.production.min.js	-0.3%	-0.3%	56.13 KB	55.94 KB	16.82 KB	16.77 KB	NODE_PROD
react-reconciler-persistent.development.js	-0.1%	-0.1%	425.08 KB	424.7 KB	90.53 KB	90.44 KB	NODE_DEV
react-reconciler-persistent.production.min.js	-0.3%	-0.3%	56.14 KB	55.95 KB	16.83 KB	16.78 KB	NODE_PROD

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