RFR: 8273934: Remove unused perfcounters

[Nils Eliasson]

This patch removes two unused PerfCounters.

Please review,
Regards,
Nils Eliasson

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Commit messages:
 - Update compileBroker.hpp
 - Remove unused PerfCounters

Changes: https://git.openjdk.java.net/jdk/pull/5093/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5093&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273934
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5093.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5093/head:pull/5093

PR: https://git.openjdk.java.net/jdk/pull/5093