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[clang] Add support for attribute 'swift_async_error'

Authored by erik.pilkington on Feb 10 2021, 8:06 AM.

Description

[clang] Add support for attribute 'swift_async_error'

This attribute specifies how an error is represented for a swift async method.
rdar://71941280

Differential revision: https://reviews.llvm.org/D96175