RFR: CODETOOLS-7902983: jcstress: Improve performance for tests with many results [v2]

[Aleksey Shipilev]

> As reported here:
>   https://mail.openjdk.java.net/pipermail/jcstress-dev/2021-June/000702.html
> 
> Cache the grading, optimize HTML table generation a little.

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Use TreeMap to poll results in HTML report

-------------

Changes:
  - all: https://git.openjdk.java.net/jcstress/pull/86/files
  - new: https://git.openjdk.java.net/jcstress/pull/86/files/8b2014b6..550db4ff

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jcstress&pr=86&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jcstress&pr=86&range=00-01

  Stats: 33 lines in 3 files changed: 2 ins; 9 del; 22 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/86.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/86/head:pull/86

PR: https://git.openjdk.java.net/jcstress/pull/86