refactor(runtime-core): replace vnode.shapeFlag checks with existed functions

[noootwo]

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Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	99.9 kB (+15 B)	37.9 kB (+20 B)	34.2 kB (+28 B)
vue.global.prod.js	158 kB (+15 B)	57.8 kB (+10 B)	51.4 kB (+8 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	47.1 kB (+15 B)	18.3 kB (+9 B)	16.8 kB (-42 B)
createApp	55.1 kB (+15 B)	21.3 kB (+9 B)	19.5 kB (+2 B)
createSSRApp	59.2 kB (+15 B)	23 kB (+11 B)	21 kB
defineCustomElement	60 kB (+15 B)	22.9 kB (+6 B)	20.8 kB (+7 B)
overall	68.9 kB (+15 B)	26.4 kB (+14 B)	24 kB (+9 B)

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@vue/compiler-core

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@vue/compiler-dom

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@vue/compiler-sfc

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@vue/compiler-ssr

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@vue/reactivity

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@vue/runtime-core

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@vue/runtime-dom

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@vue/server-renderer

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@vue/shared

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@vue/compat

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vue

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commit: a866b28