[jdk15u-dev] Integrated: 8278309: [windows] use of uninitialized OSThread::_state

[Yuri Nesterenko]

clean backport of a simple useful fix

-------------

Commit messages:
 - Backport 54993b13078ceb05736bb0e1d7ed7415c390442e

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/173/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=173&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278309
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/173.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/173/head:pull/173

PR: https://git.openjdk.java.net/jdk15u-dev/pull/173