RFR: 8258524: Instrumented EventHandler calls private instance method EventWriter.reset

[Jie Kang]

This resolves the issue by making the method public.

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Commit messages:
 - 8258524: Instrumented EventHandler calls private instance method EventWriter.reset

Changes: https://git.openjdk.java.net/jdk/pull/1824/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1824&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258524
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1824.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1824/head:pull/1824

PR: https://git.openjdk.java.net/jdk/pull/1824