RFR: CODETOOLS-7902948: jcstress: Shortcut counter copy path for copyable results

Tue Jun 1 09:14:43 UTC 2021

In jcstress, @Result instances can be reset in place. Which means that Counter has to do defensive copies before inserting results as keys. It now does it with serialization-deserialization stub. This takes about 10 ms to initialize on first key insertion. Fortunately, we can do better: if results are implicitly copyable (i.e. have only primitive fields), we can copy them directly.

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Commit messages:
 - Copyable results

Changes: https://git.openjdk.java.net/jcstress/pull/56/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=56&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902948
  Stats: 47 lines in 3 files changed: 38 ins; 4 del; 5 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/56.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/56/head:pull/56

PR: https://git.openjdk.java.net/jcstress/pull/56