[sil] Teach constant folding how to handle destructures and multiple … #22574
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…value instructions.
I also ported the constant_propagation.sil tests over for ownership and updated
a few parts of the cast optimizer so that those tests pass with and without
ownership. I purposely only updated the parts of the cast optimizer that crashed
with ownership in the relevant test so that I can add new sil code coverage for
those uncovered code paths.