V8 Buildbot: Speculatively switch slaves to solve msan failures.

masters/master.tryserver.v8/slaves.cfg

 # -*- python -*-
 # ex: set syntax=python:
 
 # Copyright 2013 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.
 
 slaves = []
 
 slaves.extend([
   {
     'master': 'V8TryServer',
     'builder': [
       'v8_linux_rel',
       'v8_linux_nodcheck_rel',
       'v8_linux_dbg',
       'v8_linux_greedy_allocator_dbg',
       'v8_linux_nosnap_rel',
       'v8_linux_nosnap_dbg',
       'v8_linux_gcc_compile_rel',
       'v8_linux64_rel',
       'v8_linux64_nacl_rel',
       'v8_linux64_asan_rel',
-      'v8_linux64_msan_rel',
       'v8_linux64_tsan_rel',
       'v8_linux64_greedy_allocator_dbg',
       'v8_linux_arm_rel',
       'v8_linux_arm_dbg',
       'v8_linux_arm64_dbg',
       'v8_linux_mipsel_compile_rel',
       'v8_linux_mips64el_compile_rel',
       'v8_android_arm_compile_rel',
       'v8_linux_chromium_gn_rel',
       'v8_android_chromium_gn_dbg',
@@ skipping 50 matching lines @@
     'bits': '64',
   } for name in ['vm660-m4', 'vm820-m4', 'vm73-a4']
 ])
 
 slaves.extend([
   {
     'master': 'V8TryServer',
     'builder': [
       'v8_linux_layout_dbg',
       'v8_linux_arm64_rel',
+      'v8_linux64_msan_rel',
     ],
     'hostname': 'build%d-m4' % i,
     'os': 'linux',
     'version': 'precise',
     'bits': '64',
   } for i in range(45, 48)
 ])