Expose LLC's -force-align-stack flag to pnacl-translate

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 136 matching lines @@
   ( '-S',              "env.set('OUTPUT_TYPE', 's')"), # Stop at .s
   ( '-c',              "env.set('OUTPUT_TYPE', 'o')"), # Stop at .o
 
   # Expose a very limited set of llc flags.
   # BE CAREFUL: anything added here can introduce skew between
   # the pnacl-translate commandline tool and the in-browser translator.
   # See: llvm/tools/pnacl-llc/srpc_main.cpp and
   # chromium/src/ppapi/native_client/src/trusted/plugin/pnacl_options.cc
   ( '(-sfi-.+)',        "env.append('LLC_FLAGS_EXTRA', $0)"),
   ( '(-mtls-use-call)', "env.append('LLC_FLAGS_EXTRA', $0)"),
+  ( '(-force-align-stack)', "env.append('LLC_FLAGS_EXTRA', $0)"),
   # These flags are usually used for linktime dead code/data
   # removal but also help with reloc overflows on ARM
   ( '(-fdata-sections)',     "env.append('LLC_FLAGS_EXTRA', $0)"),
   ( '(-ffunction-sections)', "env.append('LLC_FLAGS_EXTRA', $0)"),
   ( '(--gc-sections)',       "env.append('LD_FLAGS', $0)"),
   ( '(-mattr=.*)', "env.append('LLC_FLAGS_EXTRA', $0)"),
   ( '(-mcpu=.*)', "env.set('LLC_MCPU', '')\n"
                   "env.append('LLC_FLAGS_EXTRA', $0)"),
   ( '(-pnaclabi-verify=.*)', "env.append('LLC_FLAGS_EXTRA', $0)"),
   ( '(-pnaclabi-verify-fatal-errors=.*)', "env.append('LLC_FLAGS_EXTRA', $0)"),
@@ skipping 363 matching lines @@
 
 ADVANCED OPTIONS:
   -mattr=<+feat1,-feat2>  Toggle specific cpu features on and off.
   -mcpu=<cpu-name>        Target a specific cpu type.  Tunes code as well as
                           turns cpu features on and off.
   -S                      Generate native assembly only.
   -c                      Generate native object file only.
   --pnacl-sb              Use the translator which runs inside the NaCl sandbox.
   -O[0-3]                 Change translation-time optimization level.
 """