Fix isCompiletimeAppliedType for NoDenotation types
Fix isCompiletimeAppliedType for NoDenotation types

A NoDenotation throws an AssertionError when getting its owner. Instead
of crashing when passed a NoDenotation (which may happen in certain
erroneous cases such as tests/neg/i3083.scala), return false.

dotty-staging/dotty,lampepfl/dotty,som-snytt/dotty,sjrd/dotty,sjrd/dotty,som-snytt/dotty,som-snytt/dotty,dotty-staging/dotty,lampepfl/dotty,som-snytt/dotty,sjrd/dotty,sjrd/dotty,som-snytt/dotty,lampepfl/dotty,dotty-staging/dotty,lampepfl/dotty,dotty-staging/dotty,dotty-staging/dotty,sjrd/dotty,lampepfl/dotty