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Overview
Update supported LLVM versions.
Reason for change
We regularly (not daily) test and support LLVM 18 and 19.
Description of change
Describe the intended behaviour your changes are meant to introduce to the
project and explain how they resolve the problem stated above. Detail any
relevant changes that may affect other users of the project, such as
compilation options, runtime flags, expected inputs and outputs, API entry
points, etc.
If you have added new testing, provide details on what tests you have added
and what the purpose of them is.
Anything else we should know?
Note that we also regularly test LLVM 20, but do not plan to support it until a release is out, so for now it stays out of this document.
Checklist