Implement OneBit intrinsics for arm64.

Implemement intrinsics for highestOneBit and lowestOneBit for
java.lang.Integer and java.lang.Long.

Test: 568-checker-onebit, test_art_target, test_art_host.
Change-Id: I9d2bd04cb28b739c29811c73939fdbc25007f15a
1 file changed