RFR: 8337300: java/lang/Process/WaitForDuration.java leaves child process behind

[Naoto Sato]

This fix is to address the tier_1 test run on Windows taking much longer time than before. The test case creates child processes that remain behind after the test run has completed, which is problematic on Windows as the make command waits for the process to terminate. Confirmed tier_1/part_1 finishes around 10+min on Windows as before.

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/20379/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20379&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337300
  Stats: 8 lines in 1 file changed: 5 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/20379.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20379/head:pull/20379

PR: https://git.openjdk.org/jdk/pull/20379