Split ast-to-sst code out of func_to_air and into ast_to_sst_func #1211
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This just moves some code around so that the AST-to-SST code is in a separate file (ast_to_sst_func.rs) from the SST-to-AIR code in func_to_air.rs. I think this makes func_to_air.rs easier to understand, since it now operates just on vir::sst::Exp and air::ast::Expr, without involving vir::ast::Expr.
I'm thinking of this as an initial step towards a simpler, more cohesive AST-to-SST translation, but I'd like to merge this initial step first so that the later steps are clearer and easier to review.