[Clang importer] Import Swift declaration modifiers from swift_attr. #37975
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In addition to importing Swift attributes spelled with the C
`__attribute__((swift_attr("...")))`, also import declaration modifiers,
including `nonisolated`.
Fixes rdar://79402200.
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tkremenek
approved these changes
Jun 21, 2021
AnthonyLatsis
added
🍒 release cherry pick
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Explanation: Allows Swift declaration modifiers to be added via Clang's
__attribute__((swift_attr("..."))). This is important fornonisolated, so that Objective-C declaration can be marked asnonisolated.Scope: Only changes the mapping of the Clang attribute into Swift, for a syntax that is currently unused.
Radar/SR Issue: rdar://79402200
Risk: Low.
Testing: PR testing and CI on main.
Original PR: #37970