RFR: 8313552: Fix -Wconversion warnings in JFR code [v3]

[Markus Grönlund]

> Greetings,
> 
> this change set removes -Wconversion warnings in the JFR code.
> 
> Testing: jdk_jfr
> 
> Thanks
> Markus

Markus Grönlund has updated the pull request incrementally with one additional commit since the last revision:

  writer casts nonreversible

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15152/files
  - new: https://git.openjdk.org/jdk/pull/15152/files/5c9e1ffe..9fa7a46e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15152&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15152&range=01-02

  Stats: 39 lines in 1 file changed: 0 ins; 0 del; 39 mod
  Patch: https://git.openjdk.org/jdk/pull/15152.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15152/head:pull/15152

PR: https://git.openjdk.org/jdk/pull/15152