[cfe] Update CoreTypes to handle raw types with it

Change-Id: Ic931ff639600cc7bae03a8b51301005952d726c5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/117320
Commit-Queue: Dmitry Stefantsov <[email protected]>
Reviewed-by: Johnni Winther <[email protected]>

Author: Dmitry Stefantsov