Don't skip asan tests with atypical exit status.

SConstruct

Index: SConstruct
diff --git a/SConstruct b/SConstruct
index 25bbba72635717dba24bad1c7a491de0b40e1b1d..244da651c6044f7113ac0f66e0865a07f185fc25 100755
--- a/SConstruct
+++ b/SConstruct
@@ -1896,8 +1896,12 @@ def CommandTest(env, name, command, size='small', direct_emulation=True,
     # 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.