RFR: 8293214: Add support for Linux/LoongArch64 [v4]

[Johan Vos]

On Thu, 8 Sep 2022 07:26:48 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:
> 
>   disable msse2 by default, use IS_LOONGARCH64 and IS_AARCH64

It looks good. I'll do a build and then hopefully I can approve (those ifeq/ifneq changes often need more than a few pair of eyes)

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