RFR: JMC-7090: [JFR Writer] Make constant pool optional when registering a new type [v6]

[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:

  Fix handling 'null' for primitive values (use defaults)

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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/51581133..378608ae

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=200&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=200&range=04-05

  Stats: 17 lines in 1 file changed: 1 ins; 7 del; 9 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