Don't skip asan tests with atypical exit status.

SConstruct

 #! -*- 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 atexit
 import json
 import os
 import platform
 import re
@@ skipping 1878 matching lines @@
     return []
 
   if env.Bit('asan'):
     extra.setdefault('osenv', [])
     # Ensure that 'osenv' is a list.
     if isinstance(extra['osenv'], str):
       extra['osenv'] = [extra['osenv']]
     # ASan normally intercepts SIGSEGV and SIGFPE and disables our signal
     # handlers, which interferes with various NaCl tests, including the
     # platform qualification test built into sel_ldr.  We fix this by telling
-    # ASan not to mess with SIGSEGV or SIGFPE.
+    # ASan not to mess with SIGSEGV and SIGFPE.
     asan_options = ['handle_segv=0', 'handle_sigfpe=0']
+    # ASan aborts on errors rather than exits. This changes the expected exit
+    # codes for some tests.
+    asan_options.append('abort_on_error=0')
+
     if env.Bit('host_mac') and int(platform.mac_ver()[0].split('.')[1]) < 7:
       # MacOS 10.6 has a bug in the libsandbox system library where it
       # makes a memcmp call that reads off the end of a malloc'd block.
       # The bug appears to be harmless, but trips an ASan report.  So
       # tell ASan to suppress memcmp checks.
       asan_options.append('strict_memcmp=0')
     # TODO(mcgrathr): Remove this when we clean up all the crufty old
     # code to be leak-free.
     # https://code.google.com/p/nativeclient/issues/detail?id=3874
     asan_options.append('detect_leaks=0')
@@ skipping 2119 matching lines @@
   nacl_env.ValidateSdk()
 
 if BROKEN_TEST_COUNT > 0:
   msg = "There are %d broken tests." % BROKEN_TEST_COUNT
   if GetOption('brief_comstr'):
     msg += " Add --verbose to the command line for more information."
   print msg
 
 # separate warnings from actual build output
 Banner('B U I L D - O U T P U T:')