Remove benchmark test that was ported to log4j-perf.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1615459 13f79535-47bb-0310-9956-ffa450edef68
Use return values instead of BlackHole. Improves test readability since we're only generating single values in these tests.

See the JMH samples:

http://hg.openjdk.java.net/code-tools/jmh/file/tip/jmh-samples/src/main/java/org/openjdk/jmh/samples/JMHSample_09_Blackholes.java

http://hg.openjdk.java.net/code-tools/jmh/file/tip/jmh-samples/src/main/java/org/openjdk/jmh/samples/JMHSample_08_DeadCode.java

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1615460 13f79535-47bb-0310-9956-ffa450edef68
Migrate DebugDisabledPerformanceComparison to log4j-perf.

  - Fixes LOG4J2-762 sub-task.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1615461 13f79535-47bb-0310-9956-ffa450edef68