good first issuellvm:SelectionDAG
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説明
Similar to #161507 - add FREEZE handling to allow us to analyze demanded elements of a node through a FREEZE
The tricky bit will be to add test coverage - you will need a FREEZE node that can't be removed due to some elements possibly being undef/poison, but other elements that are not and have useful known bits data for a dependent node.
This might be easier once #161512 has landed.