[jdk25u-dev] RFR: 8366747: RISC-V: Improve VerifyMethodHandles for method handle linkers

[Fei Yang]

Hi all,

This pull request contains a backport of commit [0d7f8f83](https://github.com/openjdk/jdk/commit/0d7f8f83c7a674f5da4b93d66a24f9ce5ba46011) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Anjian Wen on 5 Sep 2025 and was reviewed by Fei Yang and Dingli Zhang.

Thanks!

-------------

Commit messages:
 - Backport 0d7f8f83c7a674f5da4b93d66a24f9ce5ba46011

Changes: https://git.openjdk.org/jdk25u-dev/pull/38/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=38&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366747
  Stats: 54 lines in 2 files changed: 48 ins; 1 del; 5 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/38.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/38/head:pull/38

PR: https://git.openjdk.org/jdk25u-dev/pull/38