RFR: 7903911: JMH: Profiler integration tests should use hot methods

[Aleksey Shipilev]

Profiler tests are more reliable if we run hot methods as their targets. Otherwise we can never see the methods in profiles. This can be made a bit more reliable.

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jmh/pull/150/files
  Webrev: https://webrevs.openjdk.org/?repo=jmh&pr=150&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903911
  Stats: 41 lines in 7 files changed: 23 ins; 11 del; 7 mod
  Patch: https://git.openjdk.org/jmh/pull/150.diff
  Fetch: git fetch https://git.openjdk.org/jmh.git pull/150/head:pull/150

PR: https://git.openjdk.org/jmh/pull/150