[riscv-port-jdk17u:riscv-port] RFR: 8285437: riscv: Fix MachNode size mismatch for MacroAssembler::verify_oops*

[Dingli Zhang]

Please review this backport to riscv-port-jdk17u.
Backport of [JDK-8285437](https://bugs.openjdk.java.net/browse/JDK-8285437). Applies cleanly.

Testing:
- A normal springboot-helloworld program using -XX:+VerifyOops passed on qemu and unmacthed.
- All tier1 passed on unmacthed (release).

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Commit messages:
 - 8285437: riscv: Fix MachNode size mismatch for MacroAssembler::verify_oops*

Changes: https://git.openjdk.org/riscv-port-jdk17u/pull/5/files
 Webrev: https://webrevs.openjdk.org/?repo=riscv-port-jdk17u&pr=5&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285437
  Stats: 8 lines in 1 file changed: 6 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/riscv-port-jdk17u/pull/5.diff
  Fetch: git fetch https://git.openjdk.org/riscv-port-jdk17u pull/5/head:pull/5

PR: https://git.openjdk.org/riscv-port-jdk17u/pull/5