[cfe] Update the api for nullability on TypeParameterTypes The nullability on the LHS of type-parameter types is assumed to be set explicitly, at the moment of creation of the type or some time after that. The latter case is needed for when the bound of the corresponding type parameter is not yet set. The second change is that the overall nullability is not stored in a field, but is computed as a getter. Change-Id: Ifbe6922c3a17943dd6c4f054976516c4f6bfc96d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/115209 Commit-Queue: Dmitry Stefantsov <dmitryas@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com>
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