RFR: CODETOOLS-7902862: jcstress: Block execution of task/run loops until compiled code is available

[Aleksey Shipilev]

Forked JVMs run in resource-constrained environments, where background compilation of hot task/run loops competes with the test execution itself. Also, when C1/C2 compilation is requested, we are better wait until that compilation actually happens.

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Commit messages:
 - Block compilation on all methods
 - Block run loop compilation to let compilers run

Changes: https://git.openjdk.java.net/jcstress/pull/19/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=19&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902862
  Stats: 16 lines in 1 file changed: 16 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/19.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/19/head:pull/19

PR: https://git.openjdk.java.net/jcstress/pull/19