RFR: 8367616: RISC-V: Auto-enable Zicboz extension for debug builds

[Dingli Zhang]

Hi,
Can you help to review this patch? Thanks!

This is a followup change after https://bugs.openjdk.org/browse/JDK-8353829. 
We can add detection and enablement of Zicboz extension.

Testing: hs:tier1 tested with qemu-system(kernel 6.14) with Zicboz extension.

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Commit messages:
 - 8367616: RISC-V: Auto-enable Zicboz extension for debug builds

Changes: https://git.openjdk.org/jdk/pull/27277/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27277&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367616
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27277.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27277/head:pull/27277

PR: https://git.openjdk.org/jdk/pull/27277