SI-5314 - CPS transform of return statement fails

Enable return expressions in CPS code if they are in tail position. Note that tail returns are
only removed in methods that do not call `shift` or `reset` (otherwise, an error is reported).

Addresses the issues pointed out in a previous pull request:
https://github.com/scala/scala/pull/720

- Addresses all issues mentioned here:
  https://github.com/scala/scala/pull/720#issuecomment-6429705

- Move transformation methods to SelectiveANFTransform.scala:
  https://github.com/scala/scala/pull/720#commitcomment-1477497

- Do not keep a list of tail returns.

Tests:
- continuations-neg/t5314-missing-result-type.scala
- continuations-neg/t5314-type-error.scala
- continuations-neg/t5314-npe.scala
- continuations-neg/t5314-return-reset.scala
- continuations-run/t5314.scala
- continuations-run/t5314-2.scala
- continuations-run/t5314-3.scala
Replace CheckCPSMethodTraverser with additional parameter on transformer methods

Other fixes:

- remove CPSUtils.allCPSMethods
- add clarifying comment about adding a plus marker to a return expression
Add missing cases in tail return transform

Disabled warnings that no longer apply because of tail returns.
Add several test cases.
Revert "Add missing cases in tail return transform"

This reverts commit 8d020fab9758ced93eb18fa51c906b95ec104aed.
Simplify the adaptation of types of return expressions

Add `adaptTypeOfReturn` hook to `AnnotationCheckers`.
Move adaptation of types of return expressions from `addAnnotations`
to `typedReturn` via `adaptTypeOfReturn` hook.

This resolves an inconsistency where previously types could have
a plus marker without additional CPS annotations. This also adds
additional test cases.
Improve doc comment on adaptTypeOfReturn in CPSAnnotationChecker
Move checkCheckable out of Infer.

Preparing for separate file with checkability logic.
Added exists3 to fast collections.
Moved isVariableName to StdNames where it belong.s
Pass a more precise type to checkCheckable when it's available.

Without it, one cannot assess the checkability of any
aspect of the pattern for which static verifiability
depends on knowledge of the scrutinee.
Improvements to unchecked warnings.

Closes SI-6275, SI-5762.

The comment says is better than I can.

/** On pattern matcher checkability:
 *
 *  Consider a pattern match of this form: (x: X) match { case _: P => }
 *
 *  There are four possibilities to consider:
 *     [P1] X will always conform to P
 *     [P2] x will never conform to P
 *     [P3] X <: P if some runtime test is true
 *     [P4] X cannot be checked against P
 *
 *  The first two cases correspond to those when there is enough static
 *  information to say X <: P or that !(X <: P) for all X and P.
 *  The fourth case includes unknown abstract types or structural
 *  refinements appearing within a pattern.
 *
 *  The third case is the interesting one.  We designate another type, XR,
 *  which is essentially the intersection of X and |P|, where |P| is
 *  the erasure of P.  If XR <: P, then no warning is emitted.
 *
 *  Examples of how this info is put to use:
 *  sealed trait A[T] ; class B[T] extends A[T]
 *    def f(x: B[Int]) = x match { case _: A[Int] if true => }
 *    def g(x: A[Int]) = x match { case _: B[Int] => }
 *
 *  `f` requires no warning because X=B[Int], P=A[Int], and B[Int] <:< A[Int].
 *  `g` requires no warning because X=A[Int], P=B[Int], XR=B[Int], and B[Int] <:< B[Int].
 *      XR=B[Int] because a value of type A[Int] which is tested to be a B can
 *      only be a B[Int], due to the definition of B (B[T] extends A[T].)
 *
 *  This is something like asSeenFrom, only rather than asking what a type looks
 *  like from the point of view of one of its base classes, we ask what it looks
 *  like from the point of view of one of its subclasses.
 */
Additional new tests for unchecked warnings.
Annotate non local returns with @unchecked.

Newly available @unchecked annotation enables removing the
special case from the unchecked logic.
Yet more tests for unchecked warnings.
Restored warning for impossible type tests.

I had this in before, then removed it since it is sometimes
redundant with an error message later issued by the pattern
matcher (e.g. scrutinee is incompatible with pattern type.)
However it also catches a lot of cases which are not errors,
so I think the modest redundancy is tolerable for now.

I also enhanced the logic for recognizing impossible
type tests, taking sealedness into account.
Nailed down the "impossible match" logic.

I will again defer to a comment.

/** Given classes A and B, can it be shown that nothing which is
 *  an A will ever be a subclass of something which is a B? This
 *  entails not only showing that !(A isSubClass B) but that the
 *  same is true of all their subclasses.  Restated for symmetry:
 *  the same value cannot be a member of both A and B.
 *
 *   1) A must not be a subclass of B, nor B of A (the trivial check)
 *   2) One of A or B must be completely knowable (see isKnowable)
 *   3) Assuming A is knowable, the proposition is true if
 *      !(A' isSubClass B) for all A', where A' is a subclass of A.
 *
 *  Due to symmetry, the last condition applies as well in reverse.
 */
Moved two tests to less breaky locations.

When there is a test called pos/t1107.scala and also a test
called pos/t1107, it is bad.
Moved isNonRefinementClassType somewhere logical.

It's not Typer's personal method.  All should be able to
drink of its wisdom.
Added logic and tests for unchecked refinements.
Merge pull request #994 from phaller/issue/5314

SI-5314 - CPS transform of return statement fails (resubmission of #987)