Reland "Non-SFI mode: Add Linux asynchronous signal support"

src/nonsfi/irt/irt.gyp

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'includes': [
     '../../../build/common.gypi',
   ],
   'targets': [
     {
       'target_name': 'nacl_sys_private',
       'type': 'none',
       'variables': {
         'nlib_target': 'libnacl_sys_private.a',
         'build_glibc': 0,
         'build_newlib': 0,
         'build_irt': 0,
         'build_pnacl_newlib': 0,
         'build_nonsfi_helper': 1,
       },
       'sources': [
         '../../untrusted/irt/irt_query_list.c',
         '../../untrusted/pthread/nc_condvar.c',
         '../../untrusted/pthread/nc_mutex.c',
         '../../untrusted/pthread/nc_thread.c',
         '../../untrusted/pthread/stack_end.c',
         '../../untrusted/valgrind/dynamic_annotations.c',
         '../linux/directory.c',
-        '../linux/irt_exception_handling.c',
+        '../linux/irt_signal_handling.c',
         '../linux/linux_futex.c',
         '../linux/linux_pthread_private.c',
         '../linux/linux_sys_private.c',
         'irt_icache.c',
         'irt_interfaces.c',
         'irt_random.c',
       ],
     },
   ],
 }