RFR: 8253421: Initialize JFR trace-IDs with zero

[Roman Kennke]

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.

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Commit messages:
 - 8253421: Initialize JFR trace-IDs with zero

Changes: https://git.openjdk.java.net/jdk/pull/285/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=285&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253421
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/285.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/285/head:pull/285

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