fix(reactivity): toRaw on object using reactive as prototype (#6268)

[hubvue]

fix: https://github.com/vuejs/core/issues/6268

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[edison1105]

Could you please resolve the conflicts?

[hubvue]

@edison1105 I have tried to resolve the conflict, please help me check, thank you.

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Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+46 B)	38 kB (+19 B)	34.2 kB (+54 B)
vue.global.prod.js	159 kB (+46 B)	57.9 kB (+25 B)	51.5 kB (+30 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	47 kB (+46 B)	18.3 kB (+22 B)	16.8 kB (+63 B)
createApp	55 kB (+46 B)	21.3 kB (+22 B)	19.4 kB (+26 B)
createSSRApp	59 kB (+46 B)	23 kB (+12 B)	20.9 kB (-2 B)
defineCustomElement	59.8 kB (+46 B)	22.9 kB (+13 B)	20.8 kB (-37 B)
overall	68.7 kB (+46 B)	26.4 kB (+19 B)	24 kB (+5 B)

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@vue/compiler-core

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commit: 38f9957

[edison1105]

Thanks for the PR. I made some refactoring to eliminate duplicate code.