RFR: 8327125: SpinYield.report should report microseconds

[Aleksey Shipilev]

On Sun, 3 Mar 2024 20:29:11 GMT, Elif Aslan <duke at openjdk.org> wrote:

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

Looks good and trivial.

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18099#pullrequestreview-1913663447