Strip CC annotations in TypeMap when CC is not enabled

[mbovel]

Hot fixes #24550. This is a mitigation, but doesn't fix the root cause.

[mbovel]

Minimized failing test:

@main def Test: Unit =
  println(IArray.equals(IArray("a"), IArray("b")))

Error:

-- [E007] Type Mismatch Error: tests/run/IArrayOps.scala:2:24 ------------------
2 |  println(IArray.equals(IArray("a"), IArray("b")))
  |                        ^^^^^^^^^^^
  |                        Found:    IArray[String]
  |                        Required: Array[? <: Object]
  |
  | longer explanation available when compiling with `-explain`

IArray.equal has signature:

def equals(xs: IArray[AnyRef^], ys: IArray[AnyRef^]): Boolean

Could the problem be that IArray is dealiased to Array? It is the case in MethodType.paramInfos already.

[mbovel]

Found the culprit: suppressIntoIfParam keeps annotations but strips opaque types aliases… So if we strip some annotations, then we suddenly leak some opaque type definitions, already from the unpickler.

Fixing by using dealiasKeepAnnotsAndOpaques instead of dealiasKeepAnnots in FollowAliasesMap.