Sbt-compatible implementation of `isPastXXXPhase`

sbt's [API extraction phase](https://github.com/sbt/sbt/blob/0.13/compile/interface/src/main/scala/xsbt/API.scala#L25)
extends `scala.reflect.internal.Phase`, which implements a bunch of methods,
such as `erasedTypes` as `false`, which are then overridden by scalac
in `GlobalPhase` (nested in scala.tools.nsc.Global).
(`erasedTypes` in particular is again overridden in the back-end -- for performance?)

However, since sbt's compiler phases extend `reflect.internal.Phase`,
the logic for detecting the current phase does not work,
as the default implementation is called (simply returning `false`),
when chasing the `prev` pointers hits an sbt-injected phase,
as its implementation is `reflect.internal`'s constant `false`.

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