[strong] Introduce --use-strong flag

src/flag-definitions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file defines all of the flags.  It is separated into different section,
 // for Debug, Release, Logging and Profiling, etc.  To add a new flag, find the
 // correct section, and use one of the DEFINE_ macros, without a trailing ';'.
 //
 // This include does not have a guard, because it is a template-style include,
 // which can be included multiple times in different modes.  It expects to have
@@ skipping 151 matching lines @@
   FLAG_ALIAS(STRING, const char*, alias, nam)
 #define DEFINE_ALIAS_ARGS(alias, nam) FLAG_ALIAS(ARGS, JSArguments, alias, nam)
 
 //
 // Flags in all modes.
 //
 #define FLAG FLAG_FULL
 
 // Flags for language modes and experimental language features.
 DEFINE_BOOL(use_strict, false, "enforce strict mode")
+DEFINE_BOOL(use_strong, false, "enforce strong mode")
+DEFINE_IMPLICATION(use_strong, use_strict)
+
+DEFINE_BOOL(strong_mode, false, "experimental strong language mode")
+DEFINE_IMPLICATION(use_strong, strong_mode)
 
 DEFINE_BOOL(es_staging, false, "enable all completed harmony features")
 DEFINE_BOOL(harmony, false, "enable all completed harmony features")
 DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony fetaures")
 DEFINE_IMPLICATION(harmony, es_staging)
 DEFINE_IMPLICATION(es_staging, harmony)
 
 // Features that are still work in progress (behind individual flags).
 #define HARMONY_INPROGRESS(V)                                           \
   V(harmony_modules, "harmony modules (implies block scoping)")         \
@@ skipping 72 matching lines @@
 DEFINE_IMPLICATION(track_double_fields, track_fields)
 DEFINE_IMPLICATION(track_heap_object_fields, track_fields)
 DEFINE_IMPLICATION(track_computed_fields, track_fields)
 DEFINE_BOOL(track_field_types, true, "track field types")
 DEFINE_IMPLICATION(track_field_types, track_fields)
 DEFINE_IMPLICATION(track_field_types, track_heap_object_fields)
 DEFINE_BOOL(smi_binop, true, "support smi representation in binary operations")
 DEFINE_BOOL(vector_ics, false, "support vector-based ics")
 DEFINE_BOOL(experimental_classes, false,
             "experimental new semantics for super() calls")
-DEFINE_BOOL(strong_mode, false, "experimental strong language mode")
 DEFINE_IMPLICATION(experimental_classes, harmony_classes)
 DEFINE_IMPLICATION(experimental_classes, harmony_object_literals)
 
 // Flags for optimization types.
 DEFINE_BOOL(optimize_for_size, false,
             "Enables optimizations which favor memory size over execution "
             "speed.")
 
 DEFINE_VALUE_IMPLICATION(optimize_for_size, max_semi_space_size, 1)
 
@@ skipping 746 matching lines @@
 #undef DEFINE_ALIAS_FLOAT
 #undef DEFINE_ALIAS_ARGS
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS
 
 #undef COMMA