I don't think there is any benefit to lowering to ptrtoint + arithmetic
+ inttoptr over the newer ptradd lowering. Even if a target does not use
codegen AA, it probably still has IR passes that benefit from correct
representation.
As far as I can tell, no targets actually use this configuration anymore
(they either don't use the LowerGEP option, or they they UseAA and thus
the ptradd lowering).
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