Fix oatdump tests on target.

Fix tests broken by
    https://android-review.googlesource.com/835240

As these are currently TEST_DISABLED_FOR_ARM_AND_MIPS,
we hit these failures only on fugu on buildbot.

Test: m test-art-host-gtest
Test: m test-art-target-gtest  # With manually enabled tests.
Bug: 119868597
Change-Id: If365fc8b8feae4b6cf95f8fd5bab83ad952cb281