RFR: 8327125: SpinYield.report should report microseconds

[Elif Aslan]

Changes to report microseconds instead of milliseconds.
GHA tested and also ran tier 2 tests.

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Commit messages:
 - 8327125: SpinYield.report should report microseconds

Changes: https://git.openjdk.org/jdk/pull/18099/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18099&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327125
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18099.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18099/head:pull/18099

PR: https://git.openjdk.org/jdk/pull/18099