Evan Wilde 4b182f6a61 Move findAsyncNode to BraceStmt ...

I need to determine when top-level code contains an `await` to determine
whether to make the source file an async context. This logic is
perfectly encapsulated in the `FindInnerAsync` AST walker.
Unfortunately, that is pushed down in Sema/ConstraintSystem and isn't
available at the AST level. I've pulled it up into the brace statement
so that I can use that as part of determining whether the source file is
async in `DeclContext::isAsyncContext`.

Unfortunately, statements don't have an AST context or evaluator or I
would make this a request.

2022-01-28 07:55:14 -08:00

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