[jdk17u-dev] RFR: 8317235: Remove Access API use in nmethod class

[Daniel Hu]

Clean backport. Cleans up incorrect Access API uses in 2 nmethod methods. Passes GHA

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

Commit messages:
 - Backport c47a0ce3f03daf7a4ec0c0c8b8626bb662836936

Changes: https://git.openjdk.org/jdk17u-dev/pull/3672/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3672&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317235
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3672.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3672/head:pull/3672

PR: https://git.openjdk.org/jdk17u-dev/pull/3672