Optionally use 31-bits SMI value for 64-bit system

build/features.gypi

 # Copyright 2013 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 23 matching lines @@
     'v8_enable_debugger_support%': 1,
 
     'v8_enable_disassembler%': 0,
 
     'v8_enable_gdbjit%': 0,
 
     'v8_object_print%': 0,
 
     'v8_enable_verify_heap%': 0,
 
+    'v8_use_31_bit_smi_value%': 0,
+
     'v8_use_snapshot%': 'true',
 
     # With post mortem support enabled, metadata is embedded into libv8 that
     # describes various parameters of the VM for use by debuggers. See
     # tools/gen-postmortem-metadata.py for details.
     'v8_postmortem_support%': 'false',
 
     # Interpreted regexp engine exists as platform-independent alternative
     # based where the regular expression is compiled to a bytecode.
     'v8_interpreted_regexp%': 0,
@@ skipping 12 matching lines @@
       }],
       ['v8_enable_gdbjit==1', {
         'defines': ['ENABLE_GDB_JIT_INTERFACE',],
       }],
       ['v8_object_print==1', {
         'defines': ['OBJECT_PRINT',],
       }],
       ['v8_enable_verify_heap==1', {
         'defines': ['VERIFY_HEAP',],
       }],
+      ['v8_use_31_bit_smi_value==1', {
+        'defines': ['V8_USE_31_BIT_SMI_VALUE',],
+      }],
       ['v8_interpreted_regexp==1', {
         'defines': ['V8_INTERPRETED_REGEXP',],
       }],
       ['v8_enable_i18n_support==1', {
         'defines': ['V8_I18N_SUPPORT',],
       }],
       ['v8_compress_startup_data=="bz2"', {
         'defines': [
           'COMPRESS_STARTUP_DATA_BZ2',
         ],
@@ skipping 16 matching lines @@
         },
         'conditions': [
           ['v8_enable_extra_checks==1', {
             'defines': ['ENABLE_EXTRA_CHECKS',],
           }],
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }