RFR: 8253421: Initialize JFR trace-IDs with zero

[Erik Gahlin]

On Mon, 21 Sep 2020 14:09:12 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> Currently, JFR trace-IDs for classloaders, packages and modules are initialized with 1, and the first call to
> atomic_inc() will update it to 2, which will be the first trace-IDs for those objects. We can initialize them to 0 and
> start counting at 1 instead.

Marked as reviewed by egahlin (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/285