RFR: 8358619: Fix interval recomputation in CPU Time Profiler [v2]

[Johannes Bechberger]

> Fixes the recomputation issue by passing either the rate or the period directly to the sampler (instead of just the rate value with the period value converted into a rate). This prevents issues when the number of cores changes during the JFR recording.

Johannes Bechberger has updated the pull request incrementally with one additional commit since the last revision:

  Fix smaller issues

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25775/files
  - new: https://git.openjdk.org/jdk/pull/25775/files/116f8326..781e3dd3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25775&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25775&range=00-01

  Stats: 124 lines in 4 files changed: 2 ins; 108 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/25775.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25775/head:pull/25775

PR: https://git.openjdk.org/jdk/pull/25775