move determineSize/finalizeSize to dsymbolsem.d

[thewilsonator]

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[RazvanN7]

I would suggest breaking this into smaller PRs. It's easier to review, to spot the bugs when the pipeline is failing and also diminishes the scope of @ibuclaw 's reverts.

[thewilsonator]

Well the merge conflicts are beyond repair, so I'm doing that regardless: #16969

Keeping this around for the diff though, will close once the pieces of it have been merged.