RFR: 7036: Invoke converters/stringify for event fields and return values [v2]

[Gunnar Morling]

> @thegreystone, ran into this left-over from the converter change: no converters/stringify was invoked for field attributes. I've attributed it to the same issue you worked on.

Gunnar Morling has updated the pull request incrementally with one additional commit since the last revision:

  6996: Invoking converters/stringify for return value

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/174/files
  - new: https://git.openjdk.java.net/jmc/pull/174/files/a37c9791..6b475598

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=174&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=174&range=00-01

  Stats: 17 lines in 1 file changed: 15 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jmc/pull/174.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/174/head:pull/174

PR: https://git.openjdk.java.net/jmc/pull/174