RFR: 8352730: RISC-V: Disable tests in qemu-user

[Robbin Ehn]

Hi, for you to consider.

These tests constantly fails in qemu-user.
Either the require host to be same arch or they are very very slow in emulation.
E.g. "ptrace(PTRACE_ATTACH, ..) failed for 405157: Function not implemented'" for SA tests.
This is the initial set of tests, there are many more, but I need to do some more verification for those.

>From bug:
> qemu-user/rv64 sets uarch to "qemu" in /proc/cpuinfo (qemu-system do not do that).
> We add this uarch to CPU feature string.
> This means we can use jtreg 'require' with cpu string to filter out tests in qemu-user.

Relevant qemu code:
https://github.com/qemu/qemu/blob/170825d14d88a1ce7fae98d5a928480f2f329b22/linux-user/riscv/target_proc.h#L29

Relevant hotspot code:
https://github.com/openjdk/jdk/blob/fa0b18bfde38ee2ffbab33a9eaac547fe8aa3c7c/src/hotspot/os_cpu/linux_riscv/vm_version_linux_riscv.cpp#L250

Tested that the require only filters out tests in qemu+riscv64.

Thanks!

/Robbin

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Commit messages:
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Changes: https://git.openjdk.org/jdk/pull/24229/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24229&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352730
  Stats: 135 lines in 100 files changed: 135 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24229.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24229/head:pull/24229

PR: https://git.openjdk.org/jdk/pull/24229