Fix ASAN build in GN.

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.
 
 # Contains the dependencies needed for asan to link into executables and
 # shared_libraries. Unconditionally depend upon this target as it is empty if
 # |is_asan| is false.
 group("deps") {
   if (is_asan) {
     public_configs = [ ":sanitizer_options_link_helper" ]
@@ skipping 12 matching lines @@
 
 source_set("options_sources") {
   visibility = [
     ":deps",
     "//:gn_visibility",
   ]
   sources = [
     "//build/sanitizers/sanitizer_options.cc",
   ]
 
+  if (is_asan) {
+    sources += [ "//build/sanitizers/asan_suppressions.cc" ]
+  }
+
   if (is_tsan) {
     sources += [ "//build/sanitizers/tsan_suppressions.cc" ]
   }
 }