[jdk17u-dev] RFR: 8309258: RISC-V: Add riscv_hwprobe syscall [v2]

[Robbin Ehn]

> Hi, please consider.
> 
> 
> RISC-V has many extensions and it's not feasible to set them correctly on the command line for users.
> There is no instruction to get the cpu, such as cpuid on x86.
> 
> 
> Still running tests, it will take a while.

Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:

  Reverted unrelated change

-------------

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/1942/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/1942/files/4c483bba..4934d8ef

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1942&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1942&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1942.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1942/head:pull/1942

PR: https://git.openjdk.org/jdk17u-dev/pull/1942