[semantic-arc-opts] Convert isDeadLiveRange into a method on a general LiveRange class. #28656
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In a forthcoming commit, I am going to need access to the "escaping" uses of a
dead live range. Rather than add /another/ argument to isDeadLiveRange, this
commit refactors the code to be a constructor on a general LiveRange class that
internally contains the lists of destroys, forwarding instructions we can
convert to be guaranteed, and consuming instructions that we do not understand.
Should be NFC.