Revert of Remove SIMD.js from V8.

test/cctest/BUILD.gn

 # Copyright 2016 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("../../gni/v8.gni")
 
 v8_executable("cctest") {
   testonly = true
 
   sources = [
@@ skipping 145 matching lines @@
     "test-object.cc",
     "test-parsing.cc",
     "test-platform.cc",
     "test-profile-generator.cc",
     "test-random-number-generator.cc",
     "test-receiver-check-hidden-prototype.cc",
     "test-regexp.cc",
     "test-representation.cc",
     "test-sampler-api.cc",
     "test-serialize.cc",
+    "test-simd.cc",
     "test-strings.cc",
     "test-strtod.cc",
     "test-symbols.cc",
     "test-thread-termination.cc",
     "test-threads.cc",
     "test-trace-event.cc",
     "test-traced-value.cc",
     "test-transitions.cc",
     "test-typedarrays.cc",
     "test-types.cc",
@@ skipping 264 matching lines @@
   ]
 
   deps = [
     "../..:v8",
     "../..:v8_libbase",
     "../..:v8_libplatform",
     "//build/config/sanitizers:deps",
     "//build/win:default_exe_manifest",
   ]
 }