RFR: CODETOOLS-7902848: jcstress: remove VM batching support [v3]

[Aleksey Shipilev]

> jcstress allows running multiple test per VM in order to optimize run times. Unfortunately, this feature gets in the way for reproducibility (multiple test contaminate the VM), error reporting (runner has to guess which test failed), and new features (like controlling the compilers). Thus, it is should go.

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

  Try to make sanity fast again

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Changes:
  - all: https://git.openjdk.java.net/jcstress/pull/10/files
  - new: https://git.openjdk.java.net/jcstress/pull/10/files/4945affb..ff118b95

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jcstress&pr=10&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jcstress&pr=10&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/10.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/10/head:pull/10

PR: https://git.openjdk.java.net/jcstress/pull/10