[8u60] RFR(S): Bulk backports of Zero fixes

[Severin Gehwolf]

Hi,

Would it be possible to push the following 3 small Zero fixes to JDK 8u
dev forest? Patches are the same as for JDK 9 modulo some copyright
changes.

Original JDK 9 Bugs:
https://bugs.openjdk.java.net/browse/JDK-8064815
https://bugs.openjdk.java.net/browse/JDK-8067331
https://bugs.openjdk.java.net/browse/JDK-8067231

Webrev:
http://cr.openjdk.java.net/~sgehwolf/webrevs/zero-fixes-jdk8u/

JDK-8064815:
src/cpu/zero/vm/stack_zero.cpp
src/cpu/zero/vm/stack_zero.inline.hpp

JDK-8067331:
src/os_cpu/bsd_zero/vm/atomic_bsd_zero.inline.hpp
src/os_cpu/linux_zero/vm/atomic_linux_zero.inline.hpp

JDK-8067231:
src/share/vm/interpreter/interpreterRuntime.cpp

Without those fixes a checkout of jdk8u doesn't even compile
(--with-jvm-variants=zero). With them Zero is able to build itself on
x86_64 and ppc64.

I'd need a sponsor in order to get those fixes pushed.

Thanks,
Severin