[LV] Separate runtime check cost from total overhead in profitability check (#176754) In isOutsideLoopWorkProfitable function, there are two places where only the runtime check cost (RtC) should be used, but incorrectly included the costs of middle blocks and early-exit blocks. 1. VectorizeMemoryCheckThreshold comparison for interleaving-only 2. Minimum trip count that bounds runtime check overhead, i.e. MinTC2 calculation This results in an overly conservative minimum profitable trip count. This patch separates the runtime check cost from the total overhead cost, and uses only RtC for VectorizeMemoryCheckThreshold comparison and the MinTC2 calculation.
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