[jdk17u] RFR: 8276801: gc/stress/CriticalNativeStress.java fails intermittently with Shenandoah

[Zhengyu Gu]

A clean backport of Shenandoah specific patch.

This is a followup backport of JDK-8276205 to fix a bug that causes updates to `nmethod` while concurrent walk is in progress.

Test:
- [x] hotspot_gc_shenandoah

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Commit messages:
 - Backport 73e6d7d74d2ddd27f11775944c6fc4fb5268106d

Changes: https://git.openjdk.java.net/jdk17u/pull/272/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=272&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276801
  Stats: 10 lines in 2 files changed: 7 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/272.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/272/head:pull/272

PR: https://git.openjdk.java.net/jdk17u/pull/272