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LLVM 19 changed DiagnosticHandlerTy. Adapt to that. Reference: https://github.com/llvm/llvm-project/commit/44d037cc258dcf179d2c48c93996bb406ecd0fae Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10928 Signed-off-by: Kai Wasserbäch <kai@dev.carbon-project.org> Reviewed-by: Karol Herbst <kherbst@redhat.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28520>