This patch adds a check to Core Lint, checkCanEtaExpand,
which ensures that primops and other wired-in functions with
no binding such as unsafeCoerce#, oneShot, rightSection...
can always be eta-expanded, by checking that the remaining
argument types have a fixed RuntimeRep.

Two subtleties came up:

  - the notion of arity in Core looks through newtypes, so we may
    need to unwrap newtypes in this check,
  - we want to avoid calling hasNoBinding on something whose unfolding
    we are in the process of linting, as this would cause a loop;
    to avoid this we add some information to the Core Lint environment
    that holds this information.

Fixes #20480