Do not hide instance field hard failure with soft failure

Rationale:
Yet another verifier inaccuracy found with fuzz testing.
Instance field verification should proceed testing instance
field access after soft failures in cases where hard failures
could still follow. Failure to do so resulted in a compiler
crash (now made bit friendly with DCHECK as well).

With crash-before/pass-after test.

BUG=29126870

Change-Id: I8674d6171158eaa2aeb0492b35dfafea76416cac