Provide a way to start debugee threads as platform or virtual for debugee in com/sun/jdi tests.
------------- Commit messages: - Added newThread method. Changes: https://git.openjdk.org/jdk/pull/12894/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12894&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8303702 Stats: 51 lines in 4 files changed: 17 ins; 11 del; 23 mod Patch: https://git.openjdk.org/jdk/pull/12894.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12894/head:pull/12894 PR: https://git.openjdk.org/jdk/pull/12894
