RFR: 7903419: jcstress: Rework split compilation support

[Aleksey Shipilev]

There are a few problems with current split compilation support: sanity checking methods are not covered by it, there are intermediate calls (bridge methods and thread infra) that might serve as compilation roots thus omitting the directives, etc.

It would be good to rework it a bit.

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Commit messages:
 - Work

Changes: https://git.openjdk.org/jcstress/pull/129/files
 Webrev: https://webrevs.openjdk.org/?repo=jcstress&pr=129&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903419
  Stats: 580 lines in 10 files changed: 347 ins; 182 del; 51 mod
  Patch: https://git.openjdk.org/jcstress/pull/129.diff
  Fetch: git fetch https://git.openjdk.org/jcstress pull/129/head:pull/129

PR: https://git.openjdk.org/jcstress/pull/129