imgdiag: add memory page index for dirty entries am: 39d0caf5e5 am: bc76fa8c3a am: b6025c55df

Original change: https://android-review.googlesource.com/c/platform/art/+/2295219

Change-Id: I21daf995658c28eee90ab24eeb833aa431ea3693
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>