Artem Chikin 1b11e8798c [IRGen] Skip witness table query for protocols that do not require one ...

Some protocols, such as protocols marked with 'objc', do not have a Witness Table.
The code before this patch assumes all protocols do have a Witness Table when generating the layout of an OpaqueTypeDescriptor, causing an assert to be triggered for opaque return types that conform to an 'objc' protocol.

Fixes SR-12257 / rdar://problem/59740179

2020-03-31 10:56:20 -07:00

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