Tentative implementation of string slices (hidden under the flag --string-slices).

src/flag-definitions.h

 // Copyright 2011 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 83 matching lines @@
 //
 // Flags in all modes.
 //
 #define FLAG FLAG_FULL
 
 // Flags for experimental language features.
 DEFINE_bool(harmony_proxies, false, "enable harmony proxies")
 
 // Flags for experimental implementation features.
 DEFINE_bool(unbox_double_arrays, false, "automatically unbox arrays of doubles")
+DEFINE_bool(string_slices, false, "use string slices")
 
 // Flags for Crankshaft.
 #ifdef V8_TARGET_ARCH_MIPS
   DEFINE_bool(crankshaft, false, "use crankshaft")
 #else
   DEFINE_bool(crankshaft, true, "use crankshaft")
 #endif
 DEFINE_string(hydrogen_filter, "", "hydrogen use/trace filter")
 DEFINE_bool(use_hydrogen, true, "use generated hydrogen for compilation")
 DEFINE_bool(build_lithium, true, "use lithium chunk builder")
@@ skipping 399 matching lines @@
 #undef FLAG
 
 #undef DEFINE_bool
 #undef DEFINE_int
 #undef DEFINE_string
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META