[constant-tracking] Track constants by default.

It is possible this CL results in various regressions, the idea
is to get some data on where constant tracking helps and where
it regresses.

Bug: v8:8361
Change-Id: I2f291788a8bea03e6eaac9f51564c1da02734d1a
Reviewed-on: https://chromium-review.googlesource.com/c/1347474
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58008}

src/flag-definitions.h

@@ -975,9 +975,9 @@ 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")