This adds the capability to trigger inference through
TypeBuilder.build when it is passed a ClassHierarchyBase object.
TypeBuilder.isExplicit is added to signal when a type can be built
without the need for inference. NamedTypedBuilder and
FunctionTypeBuilder are split into _Explicit* and _Inferred* subtype
the latter of which support late building of the type.
The new _Inferred* builders are not used yet.
Change-Id: I66fd669ae47e6eb3079461af31477215c262dcbb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/247220
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Johnni Winther
bcf350e2ea