[InitUndef] Only compute DeadLaneDetector if subreg liveness enabled (NFC) #108279
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…(NFC) InitUndef currently always computes DeadLaneDetector, but only actually uses it if subreg liveness is enabled for the target. Make the calculation optional to avoid an unnecessary compile-time impact for targets that don't enable subreg liveness.
lukel97
approved these changes
Sep 12, 2024
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InitUndef currently always computes DeadLaneDetector, but only actually uses it if subreg liveness is enabled for the target. Make the calculation optional to avoid an unnecessary compile-time impact for targets that don't enable subreg liveness.