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Auto merge of #110824 - cjgillot:const-prop-index, r=JakobDegen,oli-obk
ConstProp into PlaceElem::Index.
Noticed this while looking at keccak output MIR.
This pass aims to replace `ProjectionElem::Index` with `ProjectionElem::ConstantIndex` during ConstProp.
r? `@ghost`
