Modernize libartbase/ usage of <type_traits>... am: 495311c865 am: 81f58e8310

Original change: https://android-review.googlesource.com/c/platform/art/+/2063634

Change-Id: I835d5ba19c7d5ae13d838a4443c83f799df2df03
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>