RFR: JMC-7090: [JFR Writer] Make constant pool optional when registering a new type [v3]

[Jaroslav Bachorik]

> JMC-7090: [JFR Writer] Make constant pool optional when registering a new type

Jaroslav Bachorik has updated the pull request incrementally with one additional commit since the last revision:

  Actually run the flightrecorder.writer tests

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/200/files
  - new: https://git.openjdk.java.net/jmc/pull/200/files/a2e106c9..f342cb6d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=200&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=200&range=01-02

  Stats: 44 lines in 2 files changed: 42 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jmc/pull/200.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/200/head:pull/200

PR: https://git.openjdk.java.net/jmc/pull/200