RFR: 8315020: The macro definition for LoongArch64 zero build is not accurate. [v2]

[Fei Yang]

On Sun, 27 Aug 2023 09:03:57 GMT, Ao Qi <aoqi at openjdk.org> wrote:

>> The `LOONGARCH` is not a macro that must be defined. It is not a C/C++ pre-defined macro and is also not pre-defined in libraries such as libffi. We'd better use a macro defined in jdk.
>
> Ao Qi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   rename LOONGARCH and move RISCV32 to zero

Marked as reviewed by fyang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15428#pullrequestreview-1597131441