[LoopVectorize] Clear stale CycleAnalysis where BlockFrequencyInfo is requested (#220173) The cost model requests BlockFrequencyInfo lazily, after runImpl has simplified loops and possibly vectorized some of them. A CycleInfo cached by an earlier pass then describes the original CFG, and BlockFrequencyInfo asserts `Resolved >= Pred && "unhandled irreducible control flow"'. Clear it at the request site, gated on the CFGChanged flag the pass already uses to decide whether CFGAnalyses are preserved. This covers loop simplification, which runs before the first loop is processed. Fixes #218392, exposed by BlockFrequencyInfo migrating to CycleAnalysis. Aided by Opus 5
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