Build instructions are same as Node.js. See README for original Node.js README.
In deps/v8/src/krgc/krgc.cc edit krgc::int_flag and krgc::jit_flag to change instrumentation. See comments in that file for various options. All possible options can be viewed in deps/v8/src/krgc/krgc.h.
Use the flag -krgc_filter to specify a comma separated list of function names to compile unsafe (what constitues unsafe is from the value of krgc::jit_flag). i.e. node -krgc_filter=solve,partial_verify sudoku.js ../input-64.txt
sudo sh -c 'echo -1 > /proc/sys/kernel/perf_event_paranoid'
sudo sh -c 'echo 2 > /sys/bus/event_source/devices/cpu/rdpmc'