Fix an assert during jdwp debugging.

When debugger attaches, we patch entry points of methods in framework code.
During that process, it's possible that some method's declaring class isn't
resolved yet. We need to relax one assert for that case.

Bug: 28630805

(cherry picked from commit 3fd448a8)

Change-Id: I59fd488ad75417a64b52321677ffcac6ccdc5ce1