Regression: two tests fail on Windows with "ant test" target

with latest jdk9-dev tip build set as JAVA_HOME, nashorn's ant test fails to complete.


   [testng] Test(compile, run): test\script\trusted\event_queue.js
   [testng] jjs [<options>] <files> [-- <arguments>]
   [testng] "Illegal char <:> at index 15: --log=recompile:quiet" is not a recognized option. Use "-h" or "-help" to see a list of all supported options.
   [testng]
   [testng]
   [testng] Test(compile, run): test\script\trusted\getenv.js
   [testng] Test(compile, run): test\script\trusted\optimistic_recompilation.js
   [testng] jjs [<options>] <files> [-- <arguments>]
   [testng] "Illegal char <:> at index 15: --log=recompile:quiet" is not a recognized option. Use "-h" or "-help" to see a list of all supported options.
   [testng]
   [testng]
   [testng] Test(compile, run): test\script\trusted\urlreader.js
   [testng]
   [testng] ===============================================
   [testng] Ant suite
   [testng] Total tests run: 1558, Failures: 2, Skips: 0
   [testng] ===============================================
   [testng]
   [testng] [TestNG] Time taken by org.testng.reporters.jq.Main@f6c48ac: 513 ms
   [testng] [TestNG] Time taken by [FailedReporter passed=1556 failed=2 skipped=0]: 146 ms
   [testng] [TestNG] Time taken by org.testng.reporters.EmailableReporter@271053e1: 874 ms
   [testng] [TestNG] Time taken by jdk.nashorn.internal.test.framework.JSJUnitReportReporter@6500df86: 307 ms
   [testng] [TestNG] Time taken by org.testng.reporters.SuiteHTMLReporter@5622fdf: 3489 ms
   [testng] [TestNG] Time taken by org.testng.reporters.XMLReporter@553f17c: 190 ms

BUILD FAILED
D:\src\jdk9-dev\nashorn\make\build.xml:552: The following error occurred while executing this line:
D:\src\jdk9-dev\nashorn\make\build.xml:513: The tests failed.

Total time: 4 minutes 27 seconds

The regression is seen on Windows 7 after fix for JDK-8143642