fix: faster shallowEqual 30% performance improvement & __DEV__ Just make a judgment once

[jeryqwq]

Remove unnecessary If statement & faster shallowEqual. https://jsben.ch/MQb2y

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[react-sizebot]

Comparing: f86afca...a114460

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.min.js	=	168.90 kB	168.85 kB	=	52.69 kB	52.68 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	170.71 kB	170.66 kB	=	53.24 kB	53.23 kB
facebook-www/ReactDOM-prod.classic.js	=	590.23 kB	590.14 kB	=	103.62 kB	103.60 kB
facebook-www/ReactDOM-prod.modern.js	=	566.56 kB	566.48 kB	=	99.57 kB	99.56 kB
test_utils/ReactAllWarnings.js	Deleted	64.04 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
test_utils/ReactAllWarnings.js	Deleted	64.04 kB	0.00 kB	Deleted	16.02 kB	0.00 kB

Generated by 🚫 dangerJS against a114460