RFR: 8331150: RISC-V: Fix "bad AD file" bug

[Hamlin Li]

Hi,
Can you help to review this bug fix patch?
The issue was introduced by [JDK-8318650](https://bugs.openjdk.org/browse/JDK-8318650)
Thanks

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/18960/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18960&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331150
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18960.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18960/head:pull/18960

PR: https://git.openjdk.org/jdk/pull/18960