[jdk25u-dev] RFR: 8370708: RISC-V: Add VerifyStackAtCalls

[Fei Yang]

Hi all,

This pull request contains a backport of commit [0737a562](https://github.com/openjdk/jdk/commit/0737a5625269773dcf70b95f8b8ac90b3b6cc444) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Robbin Ehn on 5 Nov 2025 and was reviewed by Fei Yang and Feilong Jiang.

Thanks!

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Commit messages:
 - Backport 0737a5625269773dcf70b95f8b8ac90b3b6cc444

Changes: https://git.openjdk.org/jdk25u-dev/pull/5/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=5&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370708
  Stats: 31 lines in 3 files changed: 21 ins; 7 del; 3 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/5.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/5/head:pull/5

PR: https://git.openjdk.org/jdk25u-dev/pull/5