Add optional verification to check that tail calls from swifttail->swiftail are marked musttail.#2766

Merged

varungandhi-apple merged 2 commits intoswiftlang:apple/stable/20210107from

varungandhi-apple:vg-apple/stable

Mar 31, 2021

Commits on Mar 30, 2021

Use musttail in MergeFunctions for swiftasync->swiftasync tail calls.
varungandhi-apple
committed
Update musttail verification to check all swiftasync->swiftasync tail calls.
varungandhi-apple
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