RFR: 8344526: RISC-V: implement -XX:+VerifyActivationFrameSize

[SendaoYan]

Hi all,
Currently on linux-riscv64 platform the debug VM option `-XX:+VerifyActivationFrameSize` is Unimplemented. I want to implement `-XX:+VerifyActivationFrameSize` to make JVM easier to diagnose. Only effect debug build plus with option `-XX:+VerifyActivationFrameSize`, the change has been verified locally, the risk is low.

Additional testing

- [ ] jtreg tests(include tier1/2/3 etc.) on linux-aarch64 release build

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Commit messages:
 - Use sub instead of add
 - 8344526: RISC-V: implement -XX:+VerifyActivationFrameSize

Changes: https://git.openjdk.org/jdk/pull/22264/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22264&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344526
  Stats: 7 lines in 1 file changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22264.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22264/head:pull/22264

PR: https://git.openjdk.org/jdk/pull/22264