Only madvise for jank-perceptible processes am: 68ac0eb873

Original change: https://android-review.googlesource.com/c/platform/art/+/2124272

Change-Id: If88a94f3c34e69dcdc67445ab18ff6540310cbc2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>