[6.1][TypeChecker] Downgrade noasync
availability to warnings on `@preco…
#78780
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…ncurrency` declarations
Cherry-pick of #78721
Explanation:
This change helps to stage in new
async
overloads in Swift 6 language mode if@preconcurrency
declaration is not available from async contexts.Main Branch PR: [TypeChecker] Downgrade
noasync
availability to warnings on `@preco… #78721Risk: Very Low (allows some code that previously was rejected by the compiler to type-check successfully).
Reviewed By: @tshortli @hborla
Testing: Added new tests to the Sema test suite.
(cherry picked from commit 00fe563)