[IRGen] Properly compute bit mask for extra tag bits in CVW #75514
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rdar://132501359 PowerOf2Ceil is not the correct function to use, because we end up with an empty mask if there is only one value stored in the extra tag bits
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rdar://132501359
PowerOf2Ceil is not the correct function to use, because we end up with an empty mask if there is only one value stored in the extra tag bits