Subzero: Enable "pnacl-translate -arch x86-64 --use-sz".

pnacl/driver/pnacl-translate.py

 #!/usr/bin/python
 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import driver_tools
 import filetype
 import ldtools
 import multiprocessing
 import os
@@ skipping 272 matching lines @@
   is_sandbox = '0'
   is_nonsfi = '0'
   if env.getone('TARGET_OS') == 'nacl':
     if env.getbool('NONSFI_NACL'):
       is_nonsfi = '1'
     else:
       is_sandbox = '1'
   env.append('SZ_FLAGS_ARCH', '--sandbox=' + is_sandbox)
   env.append('SZ_FLAGS_ARCH', '--nonsfi=' + is_nonsfi)
   env.append('SZ_FLAGS_ARCH', '--target=' + base_arch.lower())
-  if base_arch != 'X8632':
+  if base_arch not in ('X8632', 'X8664'):
     env.set('SZ_UNSUPPORTED', '1')
     # Hard-fail on an unsupported architecture.
     if env.getbool('USE_SZ'):
       Log.Fatal('Unsupported architecture when using --sz: ' + base_arch)
   # This is a fine place to map OPT_LEVEL to the Subzero equivalent, with
   # default of -O2.
   sz_opt_map = {
     '0': '-Om1',
     '1': '-O2',
     '2': '-O2',
@@ skipping 303 matching lines @@
   -S                      Generate native assembly only.
   -c                      Generate native object file only.
   --use-sz                Use the Subzero fast translator.
   --pnacl-sb              Use the translator which runs inside the NaCl sandbox.
                           Applies to both pnacl-llc and pnacl-sz translators.
   -O[0-3]                 Change translation-time optimization level.
   -threads=<num>          Use <num> parallel threads for translation.
   -threads=auto           Automatically determine number of translation threads.
   -threads=seq            Use the minimal number of threads for translation.
 """