RFR: 8276799: Implementation of JEP 422: Linux/RISC-V Port

[Fei Yang]

On Mon, 8 Nov 2021 11:17:47 GMT, Fei Yang <fyang at openjdk.org> wrote:

> This PR implements JEP 422: Linux/RISC-V Port [1].
> The PR starts as a squashed merge of the https://openjdk.java.net/projects/riscv-port branch.
> 
> This has been tested with jtreg tier{1,2,3,4} and jcstress on HiFive Unmatched board. Dacapo, SPECjbb2015 and SPECjvm2008 benchmark tests are also carried out regularly. So it should be good enough to run most Java programs.
> 
> [1] https://openjdk.java.net/jeps/422

Rebased to master

keep alive

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PR: https://git.openjdk.java.net/jdk/pull/6294