[Concurrency] Fix nested await/try parsing and effects checking. #33807
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Fix the parsing of await/try/try?/try! so that the two can be nested (e.g., `await try f()` or `try await f()`). Then, fix the effects checking logic to preserve all throws-related information under an `await`, and preserve all async/await-related information under `try`/`try?`/`try!`. Add a number of tests, and fix 'await' handling for string interpolations as well.
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@swift-ci please smoke test |
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Fix the parsing of await/try/try?/try! so that the two can be nested
(e.g.,
await try f()ortry await f()).Then, fix the effects checking logic to preserve all throws-related
information under an
await, and preserve all async/await-relatedinformation under
try/try?/try!.Add a number of tests, and fix 'await' handling for string
interpolations as well.