[jdk11u-dev] RFR: 8270517: Add Zero support for LoongArch

[Ao Qi]

I'd like to backport this patch to jdk11u. `make/autoconf/build-aux/config.guess` does not apply cleanly due to context difference, but it is easy to resolve manually. Other files apply cleanly. A native build on LoongArch hardware is tested.

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Commit messages:
 - Backport e92e2fd4e0bc805d8f7d70f632cce0282eb1809b

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/515/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=515&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/jdk11u-dev/pull/515.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/515/head:pull/515

PR: https://git.openjdk.java.net/jdk11u-dev/pull/515