RFR: 8293214: Add support for Linux/LoongArch64 [v3]

[Johan Vos]

On Thu, 1 Sep 2022 13:00:24 GMT, Ao Qi <aoqi at openjdk.org> wrote:

>> LoongArch is a new RISC ISA. This issue proposes adding support for Linux/LoongArch64. Upstream WebKit for LoongArch64 support is not ready, but the OpenJFX part is simple and ready. When the LoongArch64 supported Webkit is updated to OpenJFX, it is supposed to work.
>> 
>> Testing:
>> - [x] base, controls, fxml, graphics and web tests, {Release,Debug}, {with WebKit,without Webkit} on Linux/x64
>> - [x] base, controls, fxml, graphics and web tests, {Release,Debug}, {with WebKit,without Webkit} on Linux/aarch64
>> - [x] base, controls, fxml and graphics tests, {Release,Debug}, without WebKit on Linux/loongarch64
>
> Ao Qi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   revert

This PR looks safe to me. I don't see a scenario where this can cause regression. I can't say if those changes are enough to build for LoongArch64 though, but as long as there is no regression I am ok.
There are a few minor optimizations that I suggested -- in general, there are more places in the build.gradle file where we could benefit from optimizations but I don't recommend doing that as part of this PR.

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PR: https://git.openjdk.org/jfx/pull/888