[riscv-port-jdk17u:riscv-port] RFR: 8285711: riscv: RVC: Support disassembler show-bytes option

[Xiaolin Zheng]

Backporting RVC-related patches. Applied cleanly.

Tested along with other patches, hotspot tier1~4 with fastdebug build.

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Commit messages:
 - 8285711: riscv: RVC: Support disassembler show-bytes option

Changes: https://git.openjdk.org/riscv-port-jdk17u/pull/20/files
 Webrev: https://webrevs.openjdk.org/?repo=riscv-port-jdk17u&pr=20&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285711
  Stats: 22 lines in 1 file changed: 20 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/riscv-port-jdk17u/pull/20.diff
  Fetch: git fetch https://git.openjdk.org/riscv-port-jdk17u.git pull/20/head:pull/20

PR: https://git.openjdk.org/riscv-port-jdk17u/pull/20