Fix sanitizer_options_link_helper for iOS.

build/config/sanitizers/BUILD.gn

 # 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.
 
 import("//build_overrides/build.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/clang/clang.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/toolchain/toolchain.gni")
@@ skipping 91 matching lines @@
         "{{bundle_executable_dir}}/{{source_file_part}}",
       ]
       public_deps = [
         ":copy_asan_runtime",
       ]
     }
   }
 }
 
 config("sanitizer_options_link_helper") {
-  if (is_mac) {
+  if (is_mac || is_ios) {
     ldflags = [ "-Wl,-U,_sanitizer_options_link_helper" ]
   } else if (!is_win) {
     ldflags = [ "-Wl,-u_sanitizer_options_link_helper" ]
   }
 }
 
 static_library("options_sources") {
   # This is a static_library instead of a source_set, as it shouldn't be
   # unconditionally linked into targets.
   visibility = [
@@ skipping 378 matching lines @@
 # This allows to selectively disable ubsan_vptr, when needed. In particular,
 # if some third_party code is required to be compiled without rtti, which
 # is a requirement for ubsan_vptr.
 config("default_sanitizer_flags_but_ubsan_vptr") {
   configs = all_sanitizer_configs - [ ":ubsan_vptr_flags" ]
 }
 
 config("default_sanitizer_flags_but_coverage") {
   configs = all_sanitizer_configs - [ ":coverage_flags" ]
 }