[lldb] Support diagnostic options in Swift REPL

[poya]

Honor some previously ignored diagnostic options like
'-debug-diagnostic-names' and '-locale' by applying them to the
diagnostic engine in the SwiftASTContext.

https://bugs.swift.org/browse/SR-14845

[poya]

@swift-ci please test

[poya]

@adrian-prantl @augusto2112
Based on recent git history to the edited files perhaps you could have a look at this, whether it's a reasonable fix and swift/main is the correct branch for it?
It looks like the ci-bot doesn't listen to me, so couldn't get the build checks triggered myself.

[augusto2112]

Thanks a lot for doing this! I've left 2 nits, but it looks great. Could you open a PR targeting stable/20210726?

[augusto2112]

@swift-ci test

[poya]

Could you open a PR targeting stable/20210726?

Switch the target branch for this PR or a new separate PR for stable/20210726?

[augusto2112]

Either way is fine!

[poya]

If the change ends up in the stable branch only, approximately how long would it take before it gets automerged into swift/main which I guess is a requirement to resolve the attached ticket?

[augusto2112]

It's not a requirement to land this on swift/main to solve the ticket, once this is done, you can mark it as solved. We're landing all the lldb changes on stable/20210726 for now.

[poya]

Changed the target branch to stable/20210726

Thanks for your review and the info around branching

[poya]

@augusto2112 Do you mind helping getting this merged now that the target branch has been updated?

[augusto2112]

@swift-ci test

[augusto2112]

@poya sorry, I think we'll have to wait a bit longer until this branch is stable enough to run the CI tests 😞

[augusto2112]

@swift-ci test

[augusto2112]

I ran the test suite locally and verified this doesn't break anything.

[augusto2112]

@poya thanks for doing this and sorry for the delay!