STC: inconsistent support for assignment of list literals

@groovy.transform.TypeChecked
void test() {
  List<String> a = [] // okay
  Set<String> b = [] // okay
  Deque<String> c = [] // GroovyCastException at runtime
  Deque<String> d = [1,2,3] // error for unknown constructor (interfaces don't have them) and error for incompatible generics
  ArrayDeque<String> e = [123] // ArrayDeque(int numElements); error for incompatible generics (bad)
  Set<String> f = ['foo', 'bar', 'foo'] // error for unknown constructor (castToType would handle this at runtime if allowed) and error for incompatible generic types (wrong)
}