RFR: CODETOOLS-7902965: jcstress: Enhance FREQ precision to 0.01%

[Aleksey Shipilev]

Most of the time, small number of samples yields "<0.1%". It would be better to produce the more precise frequency stats, one order of magnitude more.

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Commit messages:
 - CODETOOLS-7902965: jcstress: Enhance FREQ precision to 0.01%

Changes: https://git.openjdk.java.net/jcstress/pull/70/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=70&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902965
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/70.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/70/head:pull/70

PR: https://git.openjdk.java.net/jcstress/pull/70