RFR: 8257804 Test runtime/modules/ModuleStress/ModuleStressGC.java fails: 'package test defined in module jdk.test, exports list being walked' missing from stdout/stderr

[Harold Seigel]

Please review this small test change to reduce the size of the Java heap used by the test so that the test's call to System.gc() is potentially more likely to walk the JVM's module reads-list and exports-list structures.

The modified test was tested on Linux, Mac OS, and run 1000 times on Windows, where the previous failures had occurred.

Thanks, Harold

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Commit messages:
 - 8257804 Test runtime/modules/ModuleStress/ModuleStressGC.java fails: 'package test defined in module jdk.test, exports list being walked' missing from stdout/stderr

Changes: https://git.openjdk.java.net/jdk/pull/3497/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3497&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257804
  Stats: 6 lines in 1 file changed: 1 ins; 1 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3497.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3497/head:pull/3497

PR: https://git.openjdk.java.net/jdk/pull/3497