Revert of Remove SIMD.js from V8.

test/simdjs/simdjs.status

+# Copyright 2015 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.
+
+# --------------------------------------------------------------------
+# If you add a test case to this file, please try to provide
+# an explanation of why the test fails; this may ease future
+# debugging.
+# --------------------------------------------------------------------
+
+[
+[ALWAYS, {
+  # TODO(bbudge): Drop when test is fixed upstream.
+  'benchmarks/aobench': SKIP,
+  'benchmarks/averageFloat64x2': SKIP,
+  'benchmarks/averageFloat64x2Load': SKIP,
+  'benchmarks/mandelbrot': SKIP,
+  'benchmarks/sinx4': SKIP,
+
+  # TODO(bbudge): Drop this when simd implementation is faster.
+  'benchmarks/memcpy': SKIP,
+
+  # Slow tests.
+  'benchmarks/kernel-template': [PASS, SLOW],
+  'benchmarks/memset': [PASS, SLOW],
+}],
+
+######################################################################
+['byteorder == big', {
+  # shell_test_runner requires little-endian, skip it on big-endian.
+  'shell_test_runner': [SKIP],
+}],  # 'byteorder == big'
+
+]