Revert "Ship constant field tracking"

This reverts commit 78ed0e3f.

Reason for revert: Weird breakage on 
https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot/24063

Two tests should not run on GC stress, but this one is really curious:
https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket.appspot.com/8922258236346866528/+/steps/Mjsunit/0/logs/templates/0

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

TBR=jarin@chromium.org,ishell@chromium.org

Change-Id: I0017230c840f4ab712852ba338f0119503688ec9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8361
Reviewed-on: https://chromium-review.googlesource.com/c/1456108Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59421}

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, true,
+DEFINE_BOOL_READONLY(track_constant_fields, false,
                      "enable constant field tracking")
-DEFINE_BOOL_READONLY(modify_map_inplace, true, "enable in-place map updates")
+DEFINE_BOOL_READONLY(modify_map_inplace, false, "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,