RFR: 8297644: RISC-V: Compilation error when shenandoah is disabled

Fri Nov 25 15:20:25 UTC 2022

If configuring with `--disable-jvm-feature-shenandoahgc`, the risc-v port fails to build.

It seems that the code is really dependent on two header files, that is not declared, and probably has "leaked in" somewhere, but only if shenandoah is enabled. I have tried to resolve it to the best of my knowledge, but if you're not happy with the solution, by all means suggest a better way or take over this bug.

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Commit messages:
 - 8297644: [riscv] Compilation error when shenandoah is disabled

Changes: https://git.openjdk.org/jdk/pull/11370/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11370&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297644
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11370.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11370/head:pull/11370

PR: https://git.openjdk.org/jdk/pull/11370