Koltin: support collection literals

[smowton]

These are reserved for use in annotation initialisers at the moment. This would also replace the array-copying use of IrVararg outside the context of a call with .clone() call, similar to the treatment of arrayOf(*otherArray) -- this likely the intent of the synthetic code that uses this construct, in common with e.g. Python x = [*y], which would similarly amount to a clone op.

[tamasvajk]

Some tests are failing, possibly with type access expressions on int[] -> int vs Integer.

[smowton]

Yep, I had accidentally knocked out the distinction between primitive and non-primitive arrays. It appears annotations cannot carry a non-primitive int array or the like, so that path always translates Integer -> int and so on.