Add more debugging info around ResolveField.

To better diagnose the DCHECK that we have hit here:
https://android-build.googleplex.com/builds/git_master-art-host-linux-art-jit/6325844/logs/build.log

Test: test.py
Change-Id: If160b74055c27cd02bde27e29c7e7f731c458f4d
2 files changed