RFR: 8310105: LoongArch64 builds are broken after JDK-8304913 [v2]

[Ao Qi]

> LoongArch64 Zero builds are broken after [JDK-8304913](https://bugs.openjdk.org/browse/JDK-8304913):
> 
> jdk.tools.jlink.plugin.PluginException: ModuleTarget is malformed: No enum constant jdk.internal.util.Architecture.LOONGARCH64
> at jdk.jlink/jdk.tools.jlink.builder.DefaultImageBuilder.storeFiles(DefaultImageBuilder.java:181)
> at jdk.jlink/jdk.tools.jlink.internal.ImagePluginStack.storeFiles(ImagePluginStack.java:486)
> at jdk.jlink/jdk.tools.jlink.internal.ImageFileCreator.writeImage(ImageFileCreator.java:168)
> at jdk.jlink/jdk.tools.jlink.internal.ImageFileCreator.create(ImageFileCreator.java:100)
> at jdk.jlink/jdk.tools.jlink.internal.JlinkTask$ImageHelper.retrieve(JlinkTask.java:860)
> at jdk.jlink/jdk.tools.jlink.internal.ImagePluginStack.operate(ImagePluginStack.java:194)
> at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.createImage(JlinkTask.java:423)
> at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.run(JlinkTask.java:286)
> at jdk.jlink/jdk.tools.jlink.internal.Main.run(Main.java:56)
> at jdk.jlink/jdk.tools.jlink.internal.Main.main(Main.java:34)
> Error: jdk.tools.jlink.plugin.PluginException: ModuleTarget is malformed: No enum constant jdk.internal.util.Architecture.LOONGARCH64
> 
> 
> Builds tested: LoongArch64 Zero, both release and fastdebug.
> 
> If this patch conflicts with #14471, I will rebase after #14471 is integrated.

Ao Qi has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into 8310105
 - 8310105: LoongArch64 builds are broken after JDK-8304913

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14482/files
  - new: https://git.openjdk.org/jdk/pull/14482/files/351e7b42..498066a8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14482&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14482&range=00-01

  Stats: 8146 lines in 308 files changed: 4925 ins; 2137 del; 1084 mod
  Patch: https://git.openjdk.org/jdk/pull/14482.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14482/head:pull/14482

PR: https://git.openjdk.org/jdk/pull/14482