Port the Z garbage collector ([JDK-8209683](https://bugs.openjdk.java.net/browse/JDK-8209683)) to linux on ppc64le.
------------- Commit messages: - Port zgc to linux on ppc64le Changes: https://git.openjdk.java.net/jdk/pull/5842/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5842&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8274851 Stats: 1275 lines in 11 files changed: 1264 ins; 0 del; 11 mod Patch: https://git.openjdk.java.net/jdk/pull/5842.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/5842/head:pull/5842 PR: https://git.openjdk.java.net/jdk/pull/5842
