Temporarily turn off tracking of fields for stability.

src/flag-definitions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 176 matching lines @@
 DEFINE_bool(smi_only_arrays, true, "tracks arrays with only smi values")
 DEFINE_bool(compiled_transitions, false, "use optimizing compiler to "
             "generate array elements transition stubs")
 DEFINE_bool(compiled_keyed_stores, true, "use optimizing compiler to "
             "generate keyed store stubs")
 DEFINE_bool(clever_optimizations,
             true,
             "Optimize object size, Array shift, DOM strings and string +")
 DEFINE_bool(pretenure_literals, true, "allocate literals in old space")
 DEFINE_bool(track_fields, true, "track fields with only smi values")
-DEFINE_bool(track_double_fields, true, "track fields with double values")
+DEFINE_bool(track_double_fields, false, "track fields with double values")
 DEFINE_bool(track_heap_object_fields, true, "track fields with heap values")
 DEFINE_implication(track_double_fields, track_fields)
 DEFINE_implication(track_heap_object_fields, track_fields)
 
 // Flags for data representation optimizations
 DEFINE_bool(unbox_double_arrays, true, "automatically unbox arrays of doubles")
 DEFINE_bool(string_slices, true, "use string slices")
 
 // Flags for Crankshaft.
 DEFINE_bool(crankshaft, true, "use crankshaft")
@@ skipping 579 matching lines @@
 #undef DEFINE_bool
 #undef DEFINE_int
 #undef DEFINE_string
 #undef DEFINE_implication
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS