RFR: 8365636: JFR: Minor cleanup [v2]

[Erik Gahlin]

> Could I have review of Pr That cleans up various stuff (unnecessary imports, typos etc).
> 
> Testing: jdk/jdk/jfr
> 
> Thanks
> Erik

Erik Gahlin has updated the pull request incrementally with one additional commit since the last revision:

  Compare with class instead incorrect/reversed isAssignableFrom

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26811/files
  - new: https://git.openjdk.org/jdk/pull/26811/files/c90ef842..9a0c6edc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26811&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26811&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26811.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26811/head:pull/26811

PR: https://git.openjdk.org/jdk/pull/26811