[jdk17u] RFR: 8271855: [TESTBUG] Wrong weakCompareAndSet assumption in UnsafeIntrinsicsTest

[Martin Doerr]

Clean backport of JDK-8271855.

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Commit messages:
 - Backport c4d115701d102c33af937ca25dda8ac50117ac6b

Changes: https://git.openjdk.java.net/jdk17u/pull/190/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=190&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271855
  Stats: 15 lines in 1 file changed: 6 ins; 0 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/190.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/190/head:pull/190

PR: https://git.openjdk.java.net/jdk17u/pull/190