[Analysis] Clean up getPromotionCandidatesForInstruction (NFC) (#95624) Callers of getPromotionCandidatesForInstruction pass NumVals as an out parameter for the number of value-count pairs of the value profiling data, but nobody uses the out parameter. This patch removes the parameter and updates the callers. Note that the number of value-count pairs is still available via getPromotionCandidatesForInstruction(...).size().
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