Explicitly set is_clang=true on the lkgr win asan bots

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 1318 matching lines @@
 
     'gn_asan_edge_v8_heap_debug_bot_hybrid': [
       'gn', 'asan', 'edge', 'v8_heap', 'debug_bot', 'hybrid',
     ],
 
     'gn_asan_edge_fuzzer_v8_heap_release_bot_hybrid': [
       'gn', 'asan', 'edge', 'fuzzer', 'v8_heap', 'release_bot', 'hybrid',
     ],
 
     'gn_asan_edge_fuzzer_v8_heap_release_bot_x86': [
-      'gn', 'asan', 'edge', 'fuzzer', 'v8_heap', 'release_bot',
+      'gn', 'clang', 'asan', 'edge', 'fuzzer', 'v8_heap', 'release_bot',
       'x86',
     ],
 
     ('gn_asan_disable_nacl_edge_fuzzer_'
      'v8_heap_chrome_with_codecs_release_bot'): [
       'gn', 'asan', 'disable_nacl', 'edge', 'fuzzer', 'v8_heap',
       'chrome_with_codecs', 'release_bot',
     ],
 
     'gn_asan_disable_nacl_edge_fuzzer_v8_heap_debug_symbols_static_bot': [
       'gn', 'asan', 'disable_nacl', 'edge', 'fuzzer', 'v8_heap',
       'debug_symbols_static_bot',
     ],
 
     'gn_asan_disable_nacl_edge_fuzzer_v8_heap_release_bot': [
       'gn', 'asan', 'disable_nacl', 'edge', 'fuzzer', 'v8_heap', 'release_bot',
     ],
 
     'gn_asan_fuzzer_v8_heap_chrome_with_codecs_release_bot_x86': [
-      'gn', 'asan', 'fuzzer', 'v8_heap', 'chrome_with_codecs', 'release_bot',
-      'x86',
+      'gn', 'clang', 'asan', 'fuzzer', 'v8_heap', 'chrome_with_codecs',
+      'release_bot', 'x86',
     ],
 
     'gn_asan_fuzzer_v8_heap_release_bot_x86': [
-      'gn', 'asan', 'fuzzer', 'v8_heap', 'release_bot', 'x86',
+      'gn', 'clang', 'asan', 'fuzzer', 'v8_heap', 'release_bot', 'x86',
     ],
 
     'gn_asan_lsan_edge_debug_bot': [
       'gn', 'asan', 'lsan', 'edge', 'debug_bot',
     ],
 
     'gn_asan_lsan_edge_fuzzer_v8_heap_chromeos_codecs_release_bot': [
       'gn', 'asan', 'lsan', 'edge', 'v8_heap', 'chromeos_codecs',
       'release_bot',
     ],
@@ skipping 1052 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',
     },
   },
 }