Supplementary changes for handling Classes done in this CL are the
following:
* handling Supertypes
* handling Constructors
* handling remaining kinds of Procedure
* serializing AsyncMarker the same way as flags
* eliminating the need to wrap flags into IntLiteral
Change-Id: Id69c6e37f093cf80206f4657b649f79c75484775
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/154000
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Dmitry Stefantsov <dmitryas@google.com>
Dmitry Stefantsov
060d948339