Tim Northover 9ff2eb1ea5 SwiftTailCC: teach verifier musttail rules applicable to this CC. ...

SwiftTailCC has a different set of requirements than the C calling convention
for a tail call. The exact argument sequence doesn't have to match, but fewer
ABI-affecting attributes are allowed.

Also make sure the musttail diagnostic triggers if a musttail call isn't
actually a tail call.

2021-05-28 11:12:00 +01:00

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