[jdk17u] RFR: 8270517: Add Zero support for LoongArch

[Ao Qi]

I'd like to backport JDK-8270517 to jdk17u. The original patch applied cleanly. The patch added Zero support for LoongArch.

linux-loongarch64-zero-{release, fastdebug} build tested:


$ ./build/linux-loongarch64-zero-release/images/jdk/bin/java -version
openjdk version "17-internal" 2021-09-14
OpenJDK Runtime Environment (build 17-internal+0-adhoc.aoqi.jdk17u)
OpenJDK 64-Bit Zero VM (build 17-internal+0-adhoc.aoqi.jdk17u, interpreted mode)

-------------

Commit messages:
 - Backport e92e2fd4e0bc805d8f7d70f632cce0282eb1809b

Changes: https://git.openjdk.java.net/jdk17u/pull/179/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=179&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270517
  Stats: 22 lines in 3 files changed: 21 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/179.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/179/head:pull/179

PR: https://git.openjdk.java.net/jdk17u/pull/179