feat(compiler-core): support browser environment for walkIdentifiers

[zhiyuanzmj]

For Vue@3.2.5 walkIdentifiers deps isReferenced from @babel/types, so Evan removed browser support.
But this PR added the isReferenced function by built-in, so can we remove browser-check flag to support browser?

Before

./dist size: 617 KB

After

./dist size: 624 KB

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB	38.1 kB	34.3 kB
vue.global.prod.js	158 kB	58 kB	51.6 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.5 kB	18.2 kB	16.7 kB
createApp	54.6 kB	21.3 kB	19.4 kB
createSSRApp	58.8 kB	23 kB	21 kB
defineCustomElement	59.4 kB	22.9 kB	20.8 kB
overall	68.6 kB	26.4 kB	24.1 kB

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commit: be8e372