| Index: src/flag-definitions.h | 
| diff --git a/src/flag-definitions.h b/src/flag-definitions.h | 
| index bbffaa8a72973ec2d55ffbe3064f2c03c81e6b87..be2492648490f63e1c678e970895108409a3d87b 100644 | 
| --- a/src/flag-definitions.h | 
| +++ b/src/flag-definitions.h | 
| @@ -615,6 +615,8 @@ DEFINE_INT(trace_allocation_stack_interval, -1, | 
| DEFINE_BOOL(trace_fragmentation, false, "report fragmentation for old space") | 
| DEFINE_BOOL(trace_fragmentation_verbose, false, | 
| "report fragmentation for old space (detailed)") | 
| +DEFINE_BOOL(trace_mutator_utilization, false, | 
| +            "print mutator utilization, allocation speed, gc speed") | 
| DEFINE_BOOL(weak_embedded_maps_in_optimized_code, true, | 
| "make maps embedded in optimized code weak") | 
| DEFINE_BOOL(weak_embedded_objects_in_optimized_code, true, | 
|  |