RFR: CODETOOLS-7903487: JMH: Cover JMH profilers with basic tests [v6]

[Aleksey Shipilev]

> JMH profilers is the important feature, and they should be verified with at least smoke tests to capture their breakage, e.g. when JDK changes something.

Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 15 commits:

 - perfnorm should detect events better
 - Merge branch 'master' into CODETOOLS-7903487-profiler-tests
 - More profiler touchups
 - Touchups
 - Treat IPC/CPI metrics as optional for perf profiler
 - PerfAsm profilers should target a native stub
 - Print message when profiler cannot be enabled for the test
 - Checked attribute gets
 - Fix LinuxPerfNormProfilerTest
 - Fix MemPoolProfiler for JDK 8
 - ... and 5 more: https://git.openjdk.org/jmh/compare/ae39e4dd...f9afefdb

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Changes: https://git.openjdk.org/jmh/pull/109/files
 Webrev: https://webrevs.openjdk.org/?repo=jmh&pr=109&range=05
  Stats: 1114 lines in 20 files changed: 1104 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/jmh/pull/109.diff
  Fetch: git fetch https://git.openjdk.org/jmh.git pull/109/head:pull/109

PR: https://git.openjdk.org/jmh/pull/109