RFR: 8290154: [JVMCI] Implement JVMCI for RISC-V [v5]

[Doug Simon]

On Wed, 27 Jul 2022 11:25:22 GMT, Sacha Coppey <duke at openjdk.org> wrote:

>> This patch adds a partial JVMCI implementation for RISC-V, to allow using the GraalVM Native Image RISC-V LLVM backend, which does not use JVMCI for code emission.
>> It creates the jdk.vm.ci.riscv64 and jdk.vm.ci.hotspot.riscv64 packages, as well as implements a part of jvmciCodeInstaller_riscv64.cpp. To check for correctness, it enables JVMCI code installation tests on RISC-V. It will be tested soon in Native Image as well.
>
> Sacha Coppey has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add space in switch

Please change the title of this PR and the JBS issue to "[JVMCI] partially implement JVMCI for RISC-V" to more accurately reflect the code changes.

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PR: https://git.openjdk.org/jdk/pull/9587