Add pnacl-translate --sz flag to enable Subzero.

pnacl/driver/driver_env.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.
 
 # Global environment and expression parsing for the PNaCl driver
 
 
 # This dictionary initializes a shell-like environment.
 # Shell escaping and ${} substitution are provided.
@@ skipping 159 matching lines @@
   'LLVM_OPT'      : '${BASE_LLVM_BIN}/opt${EXEC_EXT}',
   'LLVM_DIS'      : '${BASE_LLVM_BIN}/llvm-dis${EXEC_EXT}',
   'LLVM_NM'       : '${BASE_LLVM_BIN}/llvm-nm${EXEC_EXT}',
   # llvm-as compiles llvm assembly (.ll) to bitcode (.bc/.po)
   'LLVM_AS'       : '${BASE_LLVM_BIN}/llvm-as${EXEC_EXT}',
   'PNACL_ABICHECK': '${BASE_LLVM_BIN}/pnacl-abicheck${EXEC_EXT}',
   'PNACL_COMPRESS': '${BASE_LLVM_BIN}/pnacl-bccompress${EXEC_EXT}',
 
   # Native LLVM tools
   'LLVM_PNACL_LLC': '${BASE_LLVM_BIN}/pnacl-llc${EXEC_EXT}',
+  'LLVM_PNACL_SZ':  '${BASE_LLVM_BIN}/pnacl-sz${EXEC_EXT}',
   # llvm-mc is llvm's native assembler
   'LLVM_MC'       : '${BASE_LLVM_BIN}/llvm-mc${EXEC_EXT}',
 
   # Binutils
   'BINUTILS_BASE'  : '${BASE_BINUTILS}/bin/le32-nacl-',
   'OBJDUMP'        : '${BINUTILS_BASE}objdump${EXEC_EXT}',
   'NM'             : '${BINUTILS_BASE}nm${EXEC_EXT}',
   'AR'             : '${BINUTILS_BASE}ar${EXEC_EXT}',
   'RANLIB'         : '${BINUTILS_BASE}ranlib${EXEC_EXT}',
   'READELF'        : '${BINUTILS_BASE}readelf${EXEC_EXT}',
@@ skipping 327 matching lines @@
 
 
 env = Environment()
 
 def override_env(meth_name, func):
   """Override a method in the global |env|, given the method name
   and the new function.
   """
   global env
   setattr(env, meth_name, types.MethodType(func, env, Environment))