fix(reactive): markRaw function return the value directly when it has been marked

[kovsu]

Closes: #11862

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+17 B)	37.7 kB (+5 B)	34 kB (-25 B)
vue.global.prod.js	159 kB (+17 B)	57.7 kB (+4 B)	51.3 kB (+33 B)

Usages

Name	Size	Gzip	Brotli
createApp	55.4 kB (+18 B)	21.3 kB (+9 B)	19.5 kB (+52 B)
createSSRApp	59.3 kB (+18 B)	23 kB (+9 B)	20.9 kB
defineCustomElement	60.1 kB (+18 B)	22.8 kB (+12 B)	20.7 kB
overall	69.1 kB (+18 B)	26.4 kB (+9 B)	24 kB (+80 B)

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commit: e9a60e9

[skirtles-code]

Could you add a test case for this?

Currently there's a typo in the PR title, markRow.

[skirtles-code]

Perhaps merge this check into the if below, rather than duplicating the return value?

[edison1105]

Agreed