RFR: CODETOOLS-7902962: jcstress: Print merged results at the end of the run

[Aleksey Shipilev]

It makes little sense to print the per-configuration results at the end of the run, when the run itself prints it. We are better off printing the merged results across all configurations.

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Commit messages:
 - CODETOOLS-7902962: jcstress: Print merged results at the end of the run

Changes: https://git.openjdk.java.net/jcstress/pull/67/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=67&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902962
  Stats: 16 lines in 3 files changed: 2 ins; 0 del; 14 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/67.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/67/head:pull/67

PR: https://git.openjdk.java.net/jcstress/pull/67