[20210726] Allow __attribute__((swift_attr)) in attribute push pragmas #3547
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This change does what it says on the tin: it allows
SwiftAttr
to be used with#pragma clang attribute push
to add Swift attributes to large regions of header files. We plan to use this to annotate headers with concurrency information.Reviewed at https://reviews.llvm.org/D112773. Fixes rdar://83499885.