[heap] Move the trace duplicate flag to release mode.

It was accidentally added to debug-only flags.

Change-Id: I329d23da5dc31186c27d43eedb021202d2694216
Reviewed-on: https://chromium-review.googlesource.com/899009Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51072}

src/flag-definitions.h

@@ -646,6 +646,9 @@ DEFINE_BOOL(trace_gc_verbose, false,
             "print more details following each garbage collection")
 DEFINE_INT(trace_allocation_stack_interval, -1,
            "print stack trace after <n> free-list allocations")
+DEFINE_INT(trace_duplicate_threshold_kb, 0,
+           "print duplicate objects in the heap if their size is more than "
+           "given threshold")
 DEFINE_BOOL(trace_fragmentation, false, "report fragmentation for old space")
 DEFINE_BOOL(trace_fragmentation_verbose, false,
             "report fragmentation for old space (detailed)")
@@ -1122,9 +1125,6 @@ DEFINE_BOOL(print_handles, false, "report handles after GC")
 DEFINE_BOOL(check_handle_count, false,
             "Check that there are not too many handles at GC")
 DEFINE_BOOL(print_global_handles, false, "report global handles after GC")
-DEFINE_INT(trace_duplicate_threshold_kb, 0,
-           "print duplicate objects in the heap if their size is more than "
-           "given threshold")
 
 // TurboFan debug-only flags.
 DEFINE_BOOL(trace_turbo_escape, false, "enable tracing in escape analysis")