[jdk21u-dev] RFR: 8327125: SpinYield.report should report microseconds

[Satyen Subramaniam]

Backporting JDK-8327125: SpinYield.report should report microseconds. This change adjusts function logic to provide microsecond granularity (as indicated by output), rather than erroneous millisecond granularity. Ran GHA Sanity Checks and local Tier 1 and 2, Patch is clean.

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Commit messages:
 - Backport 8cfacebd06da3a45d119b5378ce0c2dd591d2442

Changes: https://git.openjdk.org/jdk21u-dev/pull/1854/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1854&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/jdk21u-dev/pull/1854.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1854/head:pull/1854

PR: https://git.openjdk.org/jdk21u-dev/pull/1854