RFR: 8343026: JFR: Index into fields in the topFrame

[Erik Gahlin]

Could I have a review of a change that allows 'jfr view' queries to reference nested fields for a top frame.

Testing: jdk/jdk/jfr and diff of 'jfr view all-views' before and after the change.

This change will not impact the output of the exiting views, but it helps OpenJDK developers diagnose issues, for example, print 'lineNumber', (frame) 'type' and 'bytecodeIndex' of the top frame.

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/21705/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21705&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343026
  Stats: 175 lines in 4 files changed: 88 ins; 81 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/21705.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21705/head:pull/21705

PR: https://git.openjdk.org/jdk/pull/21705