Replace usages of Unsafe.compareAndSwap(Int|Long)

This replaces them with Atomic(Integer|Long)FieldUpdater classes
respectively in Striped64 to allow it to be compiled for Android.

This removes one of the Android compilation failures but there
are some remaining so it will still not compile.

BUG=19672715
Change-Id: Icd2d807c3a71fee0c8153414633207dd0f0d1b4f
1 file changed