[riscv-port] RFR: 8281731: riscv: Refactor instruction extraction code in nativeInst_riscv.h/cpp [v3]

[Xiaolin Zheng]

On Wed, 16 Feb 2022 04:42:13 GMT, Xiaolin Zheng <xlinzheng at openjdk.org> wrote:

>> Hi team,
>> 
>> Could I have a review of this patch - this is just a trivial refactoring with some cleanups for `nativeInst_riscv.h/cpp` using `Assembler::extract()` with raw bits, by adding `extract_rs1`, `extract_rs2`, `extract_rd`, `extract_opcode`, and `extract_funct3` to make the code cleaner and conciser. Tested hotspot tier1 on Qemu with no other errors found.
>> 
>> Thanks,
>> Xiaolin
>
> Xiaolin Zheng has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Keep readability

Thanks for the reviews, team!

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PR: https://git.openjdk.java.net/riscv-port/pull/57