PhaseOutput::code_size / __method_size is unused:
https://github.com/openjdk/jdk/blob/d20034b09c99026e7dc2213f7d88ebdc85e5b1e7/src/hotspot/share/opto/output.hpp#L80
https://github.com/openjdk/jdk/blob/d20034b09c99026e7dc2213f7d88ebdc85e5b1e7/src/hotspot/share/opto/output.hpp#L80