Don't assume resolved classes are filled in for ResolvedFieldAccessTest

The assumption that the dex cache type for class of the field is
resolved is not correct since FindClass does not fill in the
resolved type array. This resulted in crashes if dex_access_to ==
nullptr.

Also implemented for ResolvedMethodAccessTest

Bug: 31277064

Test: test-art-host CC baker, launch ZeroTouch with PGO.

(cherry picked from commit c90450a2)

Change-Id: Id5e71ea0eced1b631a3bd7d297229a66cb190954