Revert 428. Breaks 64-bit compilation.

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 25 matching lines @@
 import js2c, utils
 
 
 LIBRARY_FLAGS = {
   'all': {
     'CPPDEFINES':   ['ENABLE_LOGGING_AND_PROFILING']
   },
   'gcc': {
     'all': {
       'DIALECTFLAGS': ['-ansi'],
-      'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
+      'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS',
+          '-fno-strict-aliasing'],
       'CXXFLAGS':     ['$CCFLAGS', '-fno-rtti', '-fno-exceptions'],
       'LIBS':         ['pthread']
     },
     'mode:debug': {
       'CCFLAGS':      ['-g', '-O0'],
       'CPPDEFINES':   ['ENABLE_DISASSEMBLER', 'DEBUG']
     },
     'mode:release': {
-      'CCFLAGS':      ['-O3']
+      'CCFLAGS':      ['-O9']
     },
     'wordsize:64': {
       'CCFLAGS':      ['-m32'],
       'LINKFLAGS':    ['-m32']
     }
   },
   'msvc': {
     'all': {
       'DIALECTFLAGS': ['/nologo'],
       'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
@@ skipping 476 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()