Introduce a severity level for issues, and a 'warning' severity (un-revert #931) #952
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This un-reverts #950, effectively reintroducing the changes recently landed in #931.
The revert was needed because it revealed a latent bug in the Swift compiler, tracked by swiftlang/swift#79304. I reproduced that failure and included a workaround in the second commit on this PR.
Checklist: