[11] RFR(XS) 8207761: Split compiler/graalunit/JttReflectFTest.java

[Ekaterina Pavlova]

compiler/graalunit/JttReflectFTest.java still takes too long time to complete and can result in timeout on slow machines.
The change divides this test in two tests.

Also added debug output in test/hotspot/jtreg/compiler/graalunit/common/GraalUnitTestLauncher.java to
help to debug JDK-8206241.

  
     JBS: https://bugs.openjdk.java.net/browse/JDK-8207761
  webrev: http://cr.openjdk.java.net/~epavlova//8207761/webrev.00/index.html
testing: tested by running new tests on the machine on which previous JttReflectFTest.java test did timeout.


Thanks,
-katya

p.s.
  Igor Ignatyev volunteered to sponsor this change.