Fix dex file lookup in DumpInfo when dex file locations have full paths. am: 53258d07c1

Original change: https://android-review.googlesource.com/c/platform/art/+/2059790

Change-Id: Ie0cdcd481850096d7c23df0aa09d77e98b9544f1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>