fix(runtime-core): use feature flag for call to resolveMergedOptions

[skirtles-code]

Not sure whether this counts as fix, perf or refactor. Feel free to adjust accordingly.

I was doing some analysis of bundle size across Vue versions and noticed a jump in 3.2.39. This seems to have been caused by #6250. We didn't have size checks on PRs back then, and I don't see it discussed on the PR, so I assume this just slipped through.

It only impacts projects using __VUE_OPTIONS_API__: false.

The call to resolveMergedOptions prevents a big chunk of the Options API from being treeshaken. It's used to resolve template from extends and mixins, but I believe that is only relevant when __FEATURE_OPTIONS_API__ is true.

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB	38 kB	34.2 kB
vue.global.prod.js	159 kB	57.9 kB	51.4 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.9 kB (-1.45 kB)	18.3 kB (-477 B)	16.7 kB (-485 B)
createApp	55 kB	21.3 kB	19.4 kB
createSSRApp	59 kB	23 kB	20.9 kB
defineCustomElement	59.8 kB	22.8 kB	20.8 kB
overall	68.7 kB	26.3 kB	24 kB

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commit: 4d66a03