support ConstKind::Expr
in is_const_evaluatable
and WfPredicates::compute
#105339
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Fixes #105205
Currently we haven't implemented a way to evaluate
ConstKind::Expr(Expr::Binop(Add, 1, 2))
so I just left that with aFIXME
and adelay_span_bug
since I have no idea how to do that and it would make this a much larger (and more complicated) PR :P