Avoid accessing live-words bitmap past its size am: 36bf366f46 am: 46d4eeb5ce am: bba4220746 am: 6d8f9bf08f am: 18f49be0b7

Original change: https://android-review.googlesource.com/c/platform/art/+/2240275

Change-Id: I8dee299b781a3cd0a543973eac9f8f46f79719d9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>