[LV] Emit better debug and opt-report messages when vectorization is disallowed in the LoopVectorizer (#158513) While looking into fixing #158499, I found some other cases where the messages emitted could be improved. This PR improves both the messages printed to the debug output and the missed-optimization messages in cases where: - loop vectorization is explicitly disabled - loop vectorization is implicitly disabled by disabling all loop transformations - loop vectorization is set to happen only where explicitly enabled A branch that should currently be unreachable is also added. If the related logic ever breaks (eg. due to changes to getForce() or the ForceKind enum) this should alert devs and users. New test cases are also added to verify that the correct messages (and only them) are outputted. --------- Co-authored-by: GYT <tiborgyri@gmail.com> Co-authored-by: Florian Hahn <flo@fhahn.com>
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