SI-9702 Fix backend crash with classOf[T] annotation argument

This commit fixes various issues with classOf literals and Java
annotations.

  - Ensure that a Type within a ConstantType (i.e., a classOf literal)
    is erased, so `classOf[List[Int]]` becomes `classOf[List]`.
  - Ensure that no non-erased types are passed to `typeToBType` in the
    backend. This happens for Java annotations: the annotation type and
    `classOf` annotation arguments are not erased, the annotationInfos
    of a symbol are not touched in the compiler pipeline.
  - If T is an alias to a value class, ensure that `classOf[T]` erases
    to the value class by calling `dealiasWiden` in erasure.

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