RFR 8134641: serviceability/dcmd/compiler/CodelistTest.java fails on sun.misc.Unsafe.getUnsafe

[Alexander Kulyakhtin]

Could you, please, review the following small test-only change:

Issue: https://bugs.openjdk.java.net/browse/JDK-8134641 "serviceability/dcmd/compiler/CodelistTest.java fails with "Test failed on: sun.misc.Unsafe.getUnsafe()Lsun/misc/Unsafe;"
Webrev: http://cr.openjdk.java.net/~akulyakh/8134641/index.html

The test calls Jcmd (diagnostic command tool) Compiler.codelist and then parses the output, making sure that the first methods in the list is valid by reflection.

However Unsafe.getUnsafe() method is hidden from reflection. 
Before the fix the test did not take that into account and failed whenever Unsafe.getUnsafe happened to be among the methods to be validated.

The test has been changed to skip Unsafe.getUnsafe() method if present in the test input.

Best regards,
Alexander