[riscv-port] RFR: 8278994: riscv: RVC support [v5]

[Xiaolin Zheng]

On Tue, 4 Jan 2022 11:23:52 GMT, Yadong Wang <yadongwang at openjdk.org> wrote:

>> Xiaolin Zheng has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.
>
> src/hotspot/cpu/riscv/assembler_riscv.hpp line 431:
> 
>> 429:   INSN(remu,  0b0110011, 0b111, 0b0000001, NOT_COMPRESSIBLE);
>> 430:   INSN(remw,  0b0111011, 0b110, 0b0000001, NOT_COMPRESSIBLE);
>> 431:   INSN(remuw, 0b0111011, 0b111, 0b0000001, NOT_COMPRESSIBLE);
> 
> Shall we arrange the instructions to 2 groups (compressible and non-compressible), instead of crossing each other?

Thanks for your reviews Yadong. These macros are not existed anymore - I have separated them off and hope you like it.

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PR: https://git.openjdk.java.net/riscv-port/pull/34