1. Separate visitors for normal and smart completion, as problems are quite different
2. Remove custom memory state (exception assignment filtering) and custom DfaInstanceofValue. Instead, custom variable descriptor is used for complex expressions under instanceof or cast
3. Track TypeConstraint always; move to PsiType only when returning result
Should fix many subtle cases when cast-completion was not available
Fixes IDEA-242322 Dfa cast-completion is missing under boolean flag
GitOrigin-RevId: 1246e6ea84f8c359cc13fc805d32e0eef364ee1b
