[test] Add intel atom to perf try category.

tools/try_perf.py

 #!/usr/bin/env python
 # Copyright 2014 the V8 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.
 
 import argparse
 import os
 import subprocess
 import sys
 
 BOTS = {
   '--arm32': 'v8_arm32_perf_try',
   '--linux32': 'v8_linux32_perf_try',
   '--linux64': 'v8_linux64_perf_try',
+  '--linux64_atom': 'v8_linux64_atom_perf_try',
   '--linux64_haswell': 'v8_linux64_haswell_perf_try',
   '--nexus5': 'v8_nexus5_perf_try',
   '--nexus7': 'v8_nexus7_perf_try',
   '--nexus9': 'v8_nexus9_perf_try',
   '--nexus10': 'v8_nexus10_perf_try',
 }
 
 DEFAULT_BOTS = [
   'v8_arm32_perf_try',
   'v8_linux32_perf_try',
@@ skipping 32 matching lines @@
   cmd += ['-b %s' % bot for bot in options.bots]
   benchmarks = ['"%s"' % benchmark for benchmark in options.benchmarks]
   cmd += ['-p \'testfilter=[%s]\'' % ','.join(benchmarks)]
   if options.extra_flags:
     cmd += ['-p \'extra_flags="%s"\'' % options.extra_flags]
   subprocess.check_call(' '.join(cmd), shell=True, cwd=V8_BASE)
 
 
 if __name__ == '__main__':  # pragma: no cover
   sys.exit(main())