They are mostly necessary for argument mapping during resolution.
To support a couple checkers, we transform named args for varargs
into "fake" spread expressions.
Other than that, named arguments aren't needed for anything and often
lead to bugs where we forget to unwrap them for something, so it's
better to get rid of them.
#KT-66124
Otherwise, `FirNamedArgumentExpression` are not considered
const expr despite the value.
Merge-request: KT-MR-7052
Merged-by: Nikolay Lunyak <lunyak.kolya@mail.ru>