Both the syntax and relative order of the LLVM `nocapture` parameter
attribute changed upstream in 29441e4f5fa5f5c7709f7cf180815ba97f611297.
To reduce conflicts with rebranch, adjust FileCheck patterns to expect
both syntaxes and orders anywhere the presence of the attribute is not
critical to the test. These changes are temporary and will be cleaned
up once rebranch is merged into main.
Use the `%target-swift-5.1-abi-triple` substitution to compile the tests for
deployment to the minimum OS versions required for use of _Concurrency APIs,
instead of disabling availability checking.
Since we are force enabling the mandatory tail calls on Windows x64,
even at the expense of stack traces and debugging support, adjust the
tests to account for the difference.
The right index is the index derived for calling a function
(Signature::forAsyncEntry) rather then for receiving the results
(Signature::forAsyncAwait(); the resume fn signature).
rdar://86863272
