[riscv-port-jdk11u:riscv-port] RFR: 8299168: RISC-V: Fix MachNode size mismatch for MacroAssembler::_verify_oops*

[Dingli Zhang]

Please review this backport to riscv-port-jdk11u.
Backport of [JDK-8299168](https://bugs.openjdk.org/browse/JDK-8299168).
Applies not cleanly due to context difference, but it is easy to resolve them manually.

Testing:
- [ ] Tier1 passed without new failure on unmatched (release).

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Commit messages:
 - 8299168: RISC-V: Fix MachNode size mismatch for MacroAssembler::_verify_oops*

Changes: https://git.openjdk.org/riscv-port-jdk11u/pull/42/files
  Webrev: https://webrevs.openjdk.org/?repo=riscv-port-jdk11u&pr=42&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299168
  Stats: 14 lines in 1 file changed: 6 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/riscv-port-jdk11u/pull/42.diff
  Fetch: git fetch https://git.openjdk.org/riscv-port-jdk11u.git pull/42/head:pull/42

PR: https://git.openjdk.org/riscv-port-jdk11u/pull/42