src/share/vm/opto/parse1.cpp currently defines a number of global counters that is used to collect some statistics, but this data is only displayed in non-product builds if run with -XX:+PrintOptoStatistics. These counters should be masked from product builds.

A few of the counters are dead code, and others, like implicit_null_throws seems to have been moved to SharedRuntime a long time ago without updating print_statistics