RFR: 8319725: G1: Subtracting virtual time from wall time after JDK-8319204

[Aleksey Shipilev]

On Wed, 8 Nov 2023 15:52:50 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Noticed this when looking at the [JDK-8319204](https://bugs.openjdk.org/browse/JDK-8319204) changeset: we end subtracting `elapsedVTime()` vs `elapsedTime()`, which looks incorrect, as it does math on two unrelated quantities.

Thanks!

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PR Comment: https://git.openjdk.org/jdk/pull/16564#issuecomment-1803298266