Remove unintended soft failure downgrade.

When the supertype is not verified, we don't need to downgrade
the verification failure kind to soft failure. We can keep the
current failure kind and mark that the class will be verified
at runtime: this will allow doing fast verification (ie, with
type checks only), and supertype verification at runtime.

Test: test.py
Bug: 2831304
Change-Id: I58d1af1e60246550a72b577fa6f33af9ff8e8c89
2 files changed