v2024.1218.215136

Add error message for obscure case with parameters. (#214)

Prior to this change, if a user omitted the length of an integer
parameter *and* used that parameter as an argument to an operator or
function, the compiler with throw an `AttributeError` instead of
providing a useful message.

This is because the check that integer runtime parameters have an
explicit size happened later than the function in `expression_bounds.py`
that tried to use the size.

This change moves the check earlier (incidentally spliting
`check_constraints` into `check_constraints` and
`check_early_constraints`), and also gives it a better error message.