[LV][NFC] Fix erroneous debug message emitted during legality checks (#226162) We erroneously state that we can vectorise the loop, since LoopVectorizationLegality is no longer the oracle in matters of legality. Many of the legality checks have been moved to vplan construction, such as when attempting to vectorise some early exit loops. It's very confusing to see debug output that says: We can vectorize this loop. Not vectorising the loop because of ... I've updated the debug message to be more ambiguous. After this patch I intend to follow up with another one to fix the equally incorrect LV: Vectorization is possible but not beneficial. debug message, which assumes the reason for choosing a scalar VF is because of the cost model. However, for some early exit loops we simply failed to create any vector vplans!
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