WIP: Computational expressions tail calls support

[vzarytovskii]

Description

WIP to suport special tailcall members in CEs - ReturnFromFinal & YieldFromFinal. It's just an initial prep work to pass the flag around - when we can and can't tailcall.

Checklist

• Test cases added
• Performance benchmarks added in case of performance changes
• Release notes entry updated
• RFC added

[github-actions]

❗ Release notes required

@vzarytovskii,

Caution

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Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/8.0.300.md	No release notes found or release notes format is not correct

[abelbraaksma]

For posterity:

I think this applies to these suggestions: fsharp/fslang-suggestions#1006 and fsharp/fslang-suggestions#1200 (dupe).
Related discussion in TaskSeq: fsprojects/FSharp.Control.TaskSeq#62