oeqa.buildperf: add method for saving buildstats

(From OE-Core rev: 15b44a484ce408b0a1acfb907e2b12ebc6cce296)

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/buildperf/base.py

@@ -172,6 +172,11 @@ class BuildPerfTest(object):
         measurement['values'] = {'size': size}
         self.results['measurements'].append(measurement)
 
+    def save_buildstats(self):
+        """Save buildstats"""
+        shutil.move(self.bb_vars['BUILDSTATS_BASE'],
+                    os.path.join(self.out_dir, 'buildstats-' + self.name))
+
     @staticmethod
     def force_rm(path):
         """Equivalent of 'rm -rf'"""