DEFINE_bool(analyze_environment_liveness, true,
"analyze liveness of environment slots and zap dead values")
DEFINE_bool(load_elimination, true, "use load elimination")
-DEFINE_bool(check_elimination, true, "use check elimination")
+DEFINE_bool(check_elimination, false, "use check elimination")
DEFINE_bool(dead_code_elimination, true, "use dead code elimination")
DEFINE_bool(fold_constants, true, "use constant folding")
DEFINE_bool(trace_dead_code_elimination, false, "trace dead code elimination")