RFR: 8261483: jdk/dynalink/TypeConverterFactoryMemoryLeakTest.java failed with "AssertionError: Should have GCd a method handle by now"

[Attila Szegedi]

8261483: jdk/dynalink/TypeConverterFactoryMemoryLeakTest.java failed with "AssertionError: Should have GCd a method handle by now"

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Commit messages:
 - 8261483: Try to eliminate flakiness of the test by extending its allowed runtime and reducing the memory

Changes: https://git.openjdk.java.net/jdk/pull/2617/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2617&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261483
  Stats: 6 lines in 3 files changed: 2 ins; 2 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2617.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2617/head:pull/2617

PR: https://git.openjdk.java.net/jdk/pull/2617