Set rtc_use_memcheck=true for the FYI bot.

webrtc/build/mb_config.pyl

 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # FOR DETAILS ON THIS FILE SEE THE MAIN COPY IN //tools/mb/mb_config.pyl.
 # This is configuration for standalone WebRTC bots. It is used to keep the bot
@@ skipping 66 matching lines @@
       'Android32 Tests (L Nexus5)': 'none',
       'Android32 Tests (L Nexus7.2)': 'none',
       'Android64 Tests (L Nexus9)': 'none',
       'Linux Trusty': 'perf_release_bot_x64',
       'Mac 10.11': 'perf_release_bot_x64',
       'Win7': 'perf_release_bot_x86',
     },
     'client.webrtc.fyi': {
       # Linux
       'Linux64 GCC': 'gcc_release_bot_x64',
-      'Linux Memcheck (swarming)': 'release_bot_x64',
+      'Linux Memcheck (swarming)': 'memcheck_release_bot_x64',
 
       # Android
       'Android32 ASan (L Nexus6)': 'android_asan_shared_release_bot_arm',
       'Android32 Builder': 'android_release_bot_arm',
       'Android32 Tests (J Nexus4)': 'none',
       'Android32 Tests (K Nexus5)': 'none',
       'Android32 Tests (L Nexus6)': 'none',
 
       # Windows
       'Win32 SyzyASan (swarming)': 'win_syzyasan_release_bot_x86',
@@ skipping 340 matching lines @@
 
     'x64': {
       'gn_args': 'target_cpu="x64"',
     },
 
     'x86': {
       'gn_args': 'target_cpu="x86"',
     },
   },
 }