git: openjdk/jdk: 8303703: Add support of execution tests using virtual thread factory jtreg plugin

[Leonid Mesnik]

Changeset: be6031b8
Author:    Leonid Mesnik <lmesnik at openjdk.org>
Date:      2023-04-21 13:31:45 +0000
URL:       https://git.openjdk.org/jdk/commit/be6031b87d6e0f088a79fdd1697982bb15a7145d

8303703: Add support of execution tests using virtual thread factory jtreg plugin

Reviewed-by: erikj, jpai

! doc/testing.html
! doc/testing.md
! make/Main.gmk
! make/RunTests.gmk
! make/autoconf/configure.ac
! make/autoconf/lib-tests.m4
! make/autoconf/spec.gmk.in
+ make/test/BuildJtregTestThreadFactory.gmk
+ test/jtreg_test_thread_factory/src/share/classes/Virtual.java