Add GHC 9 support to CI

[AriFordsham]

Based on https://github.com/mithrandi/ghc-source-gen/tree/ghc9, should be fully working.

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[AriFordsham]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

Note to project maintainer: There may be cases where the author cannot leave a comment, or the comment is not properly detected as consent. In those cases, you can manually confirm consent of the commit author(s), and set the cla label to yes (if enabled on your project).

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@mithrandi

[google-cla]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

Note to project maintainer: There may be cases where the author cannot leave a comment, or the comment is not properly detected as consent. In those cases, you can manually confirm consent of the commit author(s), and set the cla label to yes (if enabled on your project).

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[blackgnezdo]

Very cool, thanks @AriFordsham for building up our CI. It reports some of the builds aren't quite healthy yet :)

[mithrandi]

@googlebot I consent.

[AriFordsham]

Now passing CI.

[AriFordsham]

@jinwoo @blackgnezdo can this be merged?

[jinwoo]

Sorry I don't think I have enough knowledge on this package to review this PR completely. As all the checks passed, this is probably fine. @blackgnezdo , @judah if you guys think this is good, I'm fine with merging. If I don't hear any responses in 2-3 days, I'll merge this.

[AriFordsham]

#77

[blackgnezdo]

@AriFordsham would you mind rewriting your commits so that they are all squashed together? I doubt there's much value in preserving this part of history. I also don't want to squash your and @mithrandi's commit together which is the only other alternative in the UI

[blackgnezdo]

@mithrandi I believe your two commits would also benefit from either getting squashed or having a more detailed description.

[blackgnezdo]

I have some superficial comments since I don't deeply understand the package.

[AriFordsham]

All done.

[blackgnezdo]

@mithrandi once you squash your two changes we should be good to go.

[mithrandi]

I think I need @AriFordsham to squash them for me (no write access to this branch).

[AriFordsham]

@mithrandi If you squash them on your branch at https://github.com/mithrandi/ghc-source-gen/tree/ghc9 I can pull them in. I wouldn't want you to lose the attribution.

[mithrandi]

Done!

[AriFordsham]

Ready to roll.

[blackgnezdo]

Thank you @mithrandi and @AriFordsham! This was an example of awesome open source collaboration!