RFR: 8290154: [JVMCI] partially implement JVMCI for RISC-V [v7]

[Doug Simon]

On Tue, 23 Aug 2022 11:29:45 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. More testing is performed in Native Image.
>
> Sacha Coppey has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix error when emitting LUI and removed vector registers

src/hotspot/share/runtime/deoptimization.hpp line 345:

> 343:     }
> 344:   }
> 345:   static int trap_request_index(int trap_request) {

Please add a comment as to why `noinline` is required here.

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