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

[Marcus Hirt]

On Mon, 18 Jan 2021 15:02:02 GMT, Jaroslav Bachorik <jbachorik at openjdk.org> wrote:

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

Looks fine to me, but let's check with our first user. ;)

@AlexVanGogen - is something like this ok?

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