RFR: 8366082: Improve queue size computation in CPU-time sampler

[Johannes Bechberger]

Improve the sample queue size computation for the CPU-time sampler by increasing the size dynamically when needed, but keeping the default size small.

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Commit messages:
 - Improve queue size computation

Changes: https://git.openjdk.org/jdk/pull/26926/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26926&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366082
  Stats: 59 lines in 4 files changed: 41 ins; 6 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/26926.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26926/head:pull/26926

PR: https://git.openjdk.org/jdk/pull/26926