Ding Ye 56888e2395 [IRGen] Do not emit ObjC property ivar field for non-trivially-representable types. (#21976) ...

This patch prevents writing ivar field for ObjC property whose type
is not trivially representable in ObjC within its DeclContext.
For example, in the case of the property `@objc var foo: String`,
it is accessed as an NSString on the ObjC side. Without this patch,
this property is backed with an ivar, to which direct accesses would
fail.

Resolves: SR-9557.

2019-01-18 17:58:53 -08:00

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