Modernize libartbase/ usage of <type_traits>... am: 495311c865 am: 81f58e8310 am: dd260c1e63

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

Change-Id: I328c92900c3d2e2326382466c4e7928f6f3b7196
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>