| Index: src/flag-definitions.h | 
| diff --git a/src/flag-definitions.h b/src/flag-definitions.h | 
| index 5b5d60d429cd84b86a0006a14e446ed77fb1153c..93adb620da0d51668cde4dc84a9fb713fbf704d4 100644 | 
| --- a/src/flag-definitions.h | 
| +++ b/src/flag-definitions.h | 
| @@ -304,7 +304,7 @@ DEFINE_bool(array_index_dehoisting, true, | 
| 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, false, "use check elimination") | 
| +DEFINE_bool(check_elimination, true, "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") | 
|  |