RFR: 8344014: Simplify TracePhase constructor

[Thomas Stuefe]

On Tue, 12 Nov 2024 20:55:51 GMT, Dean Long <dlong at openjdk.org> wrote:

> This looks OK, but doesn't seem strictly necessary for JDK-8344009. We could get the PhaseTraceId from `accumulator - &Phase::timers[0]`.

I thought so too, but it seemed a bit ugly and brittle, and the simplification seemed worth it anyhow.

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PR Comment: https://git.openjdk.org/jdk/pull/22029#issuecomment-2473105069