Ship constant field tracking

Bug: v8:8361
Change-Id: I25c52c708517cf27add89e0c5c97e6d21abb2a9a
Reviewed-on: https://chromium-review.googlesource.com/c/1456089Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59415}

src/flag-definitions.h

@@ -992,9 +992,9 @@ DEFINE_BOOL(trace_ic, false,
 DEFINE_IMPLICATION(trace_ic, log_code)
 DEFINE_INT(ic_stats, 0, "inline cache state transitions statistics")
 DEFINE_VALUE_IMPLICATION(trace_ic, ic_stats, 1)
-DEFINE_BOOL_READONLY(track_constant_fields, false,
+DEFINE_BOOL_READONLY(track_constant_fields, true,
                      "enable constant field tracking")
-DEFINE_BOOL_READONLY(modify_map_inplace, false, "enable in-place map updates")
+DEFINE_BOOL_READONLY(modify_map_inplace, true, "enable in-place map updates")
 DEFINE_BOOL_READONLY(fast_map_update, false,
                      "enable fast map update by caching the migration target")
 DEFINE_INT(max_polymorphic_map_count, 4,