Revert^2 "art: Extend sun.misc.Unsafe presence in the Core Platform API"

This relands 84b1d5539517d6b6fb0a32a3a871971e5120866c and reverts
commit 276ed2824da970c04f41bdd4d9c3e20852d32344. Original revert
was based on a build that didn't include libcore component of this
change.

Bug: 144502743
Test: boot device && adb logcat | grep "Core platform"

Change-Id: I1972f2b4e381ba52a0fa0fd511ef8ac5a9825575
1 file changed