Specify SwiftSyntax601 in more places.

[mbrandonw]

Currently the trick of using version modules to conditionally access Swift syntax is broken for version 601:

#if canImport(SwiftSyntax601)
  // Code in here is never compiled
#endif

We use these version modules heavily to support SwiftSyntax all the way back to 509, but now multiple packages in our ecosystem are broken with no way to fix them other than rolling back all SwiftSyntax support back to 600.

I believe the fix is to simply update the dependencies of SwiftSyntax to use SwiftSyntax601, but I went ahead and fixed up other inconsistencies with version modules throughout the repo. If this is the correct fix then hopefully we can get a patch release of SwiftSyntax released soon?

[bnbarham]

@swift-ci please test

[bnbarham]

Thanks @mbrandonw

If this is the correct fix then hopefully we can get a patch release of SwiftSyntax released soon?

Yes, would you be able to cherry-pick this to release/6.1 🙏?

[bnbarham]

Also CC @keith for the bazel changes, but they look fine to me.

[mbrandonw]

Yes, would you be able to cherry-pick this to release/6.1 🙏?

Yep can do. Just so that I understand, you want me to make a new PR with these changes that targets release/6.1?

[keith]

Yep bazel changes look good! Thanks for making them!

[bnbarham]

Yep can do. Just so that I understand, you want me to make a new PR with these changes that targets release/6.1?

Yep 🙇‍♂️!

[mbrandonw]

@bnbarham Done here #3036.

[bnbarham]

@swift-ci please test

[bnbarham]

@swift-ci please test Windows platform

[bnbarham]

@swift-ci please test Windows platform

[bnbarham]

Thanks again @mbrandonw!