test: convert buffer benchmark to runBenchmark

PR-URL: nodejs/node#15349
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>

test/parallel/test-benchmark-buffer.js

@@ -0,0 +1,24 @@
+'use strict';
+
+require('../common');
+
+const runBenchmark = require('../common/benchmark');
+
+runBenchmark('buffers',
+             [
+               'aligned=true',
+               'args=1',
+               'encoding=utf8',
+               'len=2',
+               'method=',
+               'n=1',
+               'noAssert=true',
+               'pieces=1',
+               'pieceSize=1',
+               'search=@',
+               'size=1',
+               'source=array',
+               'type=',
+               'withTotalLength=0'
+
+             ]);