gn: add is_ubsan_no_recover to halt the program on the first problem.

tools/mb/mb_config.pyl

 # Copyright 2015 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.
 
 {
   # This is a map of buildbot master names -> buildbot builder names ->
   # config names (where each config name is a key in the 'configs' dict,
   # below). MB uses this dict to look up which config to use for a given bot.
   'masters': {
     # Take care when changing any of these builders to ensure that you do not
@@ skipping 1139 matching lines @@
 
     'gn_release_trybot_x64': [
       'gn', 'release_trybot', 'x64',
     ],
 
     'gn_release_trybot_x86': [
       'gn', 'release_trybot', 'x86',
     ],
 
     'gn_ubsan_vptr_release_bot': [
-      'gn', 'ubsan_vptr', 'release_bot',
+      'gn', 'ubsan_vptr', 'ubsan_no_recover_hack', 'release_bot',
     ],
 
     'gyp_asan_lsan_edge_fuzzer_debug_bot': [
       'gyp', 'asan', 'lsan', 'edge', 'fuzzer', 'debug_bot',
     ],
 
     'gyp_asan_lsan_edge_fuzzer_v8_heap_symbolized_release_bot': [
       'gyp', 'asan', 'lsan', 'edge', 'v8_heap', 'symbolized', 'release_bot',
     ],
 
@@ skipping 1129 matching lines @@
 
     'ubsan': {
       'gn_args': 'is_ubsan=true',
       'gyp_defines': 'ubsan=1',
     },
 
     'ubsan_no_recover_hack': {
       # TODO(krasin): Remove when https://llvm.org/bugs/show_bug.cgi?id=25569
       # is fixed and just use ubsan_vptr instead.
       'mixins': ['ubsan_vptr'],
-      'gn_args': 'error', # TODO(GYP): need a GN equivalent for this
+      'gn_args': 'is_ubsan_no_recover=true',
       'gyp_defines': 'release_extra_cflags=-fno-sanitize-recover=undefined',
     },
 
     'ubsan_vptr': {
       'gn_args': 'is_ubsan_vptr=true',
       'gyp_defines': 'ubsan_vptr=1',
     },
 
     'use_lld': {
       'gn_args': 'use_lld=true',
@@ skipping 26 matching lines @@
     },
 
     'drfuzz': { 'gn_args': 'use_drfuzz=true' },
 
     'drmemory': {
       'gn_args': 'is_component_build=true enable_iterator_debugging=false',
       'gyp_defines': 'component=shared_library build_for_tool=drmemory',
     },
   },
 }