[istd] banish sexp_{list,option}
[istd] banish sexp_{list,option}

Summary:
It's annoying to see `sexp_list` everywhere instead of `list`, eg in
merlin.

See also D17907938.

Reviewed By: ngorogiannis

Differential Revision: D17927994

fbshipit-source-id: 84599e8bc

facebook/infer,facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,facebook/infer,jvillard/infer,facebook/infer,facebook/infer,jvillard/infer,facebook/infer,facebook/infer,jvillard/infer,jvillard/infer