IRGen: Fix multipayload enums with indirect cases #16916
Merged
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swift_unknownRetain does not work on indirect enum heap buffers.
The existing logic would say: oh one case is
ReferenceCounting::BridgeObject (which on its own probably would not
work with swift_unknownRetain), oh and another second case is NativeObject (for
the indirect buffer), let's use unknowRetain.
Pair the logic down to only use a single style of reference count
operation if all cases are of the same ReferenceCounting type.
rdar://40525268