switch benchmark suite to -O2+ from -O3

tests/runner.py

@@ -9338,8 +9338,8 @@ elif 'benchmark' in str(sys.argv):
       final_filename = os.path.join(dirname, name + '.js')
 
       try_delete(final_filename)
-      output = Popen(['python', EMCC, filename, '-O3',
-                      #'-O2', '-s', 'INLINING_LIMIT=0', '-s', 'DOUBLE_MODE=0', '-s', 'PRECISE_I64_MATH=0',
+      output = Popen(['python', EMCC, filename, #'-O3',
+                      '-O2', '-s', 'INLINING_LIMIT=0', '-s', 'DOUBLE_MODE=0', '-s', 'PRECISE_I64_MATH=0',
                       '-s', 'TOTAL_MEMORY=100*1024*1024', '-s', 'FAST_MEMORY=10*1024*1024',
                       '-o', final_filename] + emcc_args, stdout=PIPE, stderr=self.stderr_redirect).communicate()
       assert os.path.exists(final_filename), 'Failed to compile file: ' + output[0]