Slava Pestov 9170378d25 RequirementMachine: Fix handling of Sendable conformances for superclass requirements ...

Don't set allowMissing to true when checking conformance of a superclass requirement
to a protocol, since this prevents us from being able to express something like
'T : C, T : Sendable' to mean 'T can be any subclass of C which is also Sendable'.

Fixes rdar://problem/91530343.

2022-04-11 14:52:32 -04:00

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