RFR: 8241331: Implement basic support of test execution using vthread wrapper

Mon Mar 23 18:40:33 UTC 2020

Reviewed-by: sspitsyn
The MAIN_WRAPPER variable into make build to execute tests in virtual threads.

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Commit messages:
 - 8241331: Implement basic support of test execution using vthread wrapper (#2)

Changes: https://git.openjdk.java.net/loom/pull/8/files
 Webrev: https://webrevs.openjdk.java.net/loom/8/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8241331
  Stats: 553 lines in 9 files changed: 548 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/loom/pull/8.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/8/head:pull/8

PR: https://git.openjdk.java.net/loom/pull/8