X64: Convert smis to holding 32 bits of payload.

SConstruct

 # Copyright 2008 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 156 matching lines @@
       'LINKFLAGS':    ['-m32']
     },
     'arch:arm': {
       'CPPDEFINES':   ['V8_TARGET_ARCH_ARM']
     },
     'simulator:arm': {
       'CCFLAGS':      ['-m32'],
       'LINKFLAGS':    ['-m32']
     },
     'arch:x64': {
-      'CPPDEFINES':   ['V8_TARGET_ARCH_X64'],
+      'CPPDEFINES':   ['V8_TARGET_ARCH_X64', 'V8_LONG_SMI'],
       'CCFLAGS':      ['-m64'],
       'LINKFLAGS':    ['-m64'],
     },
     'prof:oprofile': {
       'CPPDEFINES':   ['ENABLE_OPROFILE_AGENT']
     }
   },
   'msvc': {
     'all': {
       'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
       'CXXFLAGS':     ['$CCFLAGS', '/GR-', '/Gy'],
       'CPPDEFINES':   ['WIN32'],
       'LINKFLAGS':    ['/INCREMENTAL:NO', '/NXCOMPAT', '/IGNORE:4221'],
       'CCPDBFLAGS':   ['/Zi']
     },
     'verbose:off': {
       'DIALECTFLAGS': ['/nologo'],
       'ARFLAGS':      ['/NOLOGO']
     },
     'arch:ia32': {
       'CPPDEFINES':   ['V8_TARGET_ARCH_IA32', '_USE_32BIT_TIME_T'],
       'LINKFLAGS':    ['/MACHINE:X86'],
       'ARFLAGS':      ['/MACHINE:X86']
     },
     'arch:x64': {
-      'CPPDEFINES':   ['V8_TARGET_ARCH_X64'],
+      'CPPDEFINES':   ['V8_TARGET_ARCH_X64', 'V8_LONG_SMI'],
       'LINKFLAGS':    ['/MACHINE:X64'],
       'ARFLAGS':      ['/MACHINE:X64']
     },
     'mode:debug': {
       'CCFLAGS':      ['/Od', '/Gm'],
       'CPPDEFINES':   ['_DEBUG', 'ENABLE_DISASSEMBLER', 'DEBUG'],
       'LINKFLAGS':    ['/DEBUG'],
       'msvcrt:static': {
         'CCFLAGS': ['/MTd']
       },
@@ skipping 767 matching lines @@
 # version of scons.  Also, there's a bug in some revisions that
 # doesn't allow this flag to be set, so we swallow any exceptions.
 # Lovely.
 try:
   SetOption('warn', 'no-deprecated')
 except:
   pass
 
 
 Build()