RFR: CODETOOLS-7902877: jcstress: Fix C2-only configuration filtering

[Aleksey Shipilev]

CODETOOLS-7902872 rewrote CompileMode code, and introduced a little regression here:
 https://github.com/openjdk/jcstress/commit/67158528f9abdf49f9ae23c704c068a76075b4fe?branch=67158528f9abdf49f9ae23c704c068a76075b4fe&diff=unified#diff-90c43d0da51e119c248c273763e3e5d3b6b14586492fb836c480ecd144af56e5L143-R144

The filter should say "config.onlyIfC2() && !hasC2". The "!" was accidentally dropped.

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Commit messages:
 - CODETOOLS-7902877: jcstress: Fix C2-only configuration filtering

Changes: https://git.openjdk.java.net/jcstress/pull/25/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=25&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902877
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/25.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/25/head:pull/25

PR: https://git.openjdk.java.net/jcstress/pull/25