[aarch64-port-dev ] RFR(M): 8209835: Aarch64: elide barriers on all volatile operations

[Roland Westrelin]

> This is what we need for LSE. I'm running jcstress again.

Thanks for the patch. So this one fixes 8211320 (Aarch64:
unsafe.compareAndSetByte() and unsafe.compareAndSetShort() c2 intrinsics
broken with negative expected value) and not this one (barrier elision),
right?

Roland.