optimizer: switch to more general data structure of SSADefUse
#44730
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Now `(du::SSADefUse).uses` field can contain arbitrary "usages" to be eliminated. This structure might be helpful for implementing array SROA, for example. Also slightly tweaks the implementation of `ccall` preserve elimination.
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Now
(du::SSADefUse).usesfield can contain arbitrary "usages" to be eliminated.This structure might be helpful for implementing array SROA, for example.
Also slightly tweaks the implementation of
ccallpreserve elimination./cc @vtjnash what do you think on this version?