Revert of Remove SIMD.js from V8.

test/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/isolate.gni")
 import("../gni/v8.gni")
 
 group("gn_all") {
   testonly = true
 
@@ skipping 13 matching lines @@
   if (v8_enable_inspector) {
     deps += [ "inspector:inspector-test" ]
   }
 
   if (v8_test_isolation_mode != "noop") {
     deps += [
       ":benchmarks_run",
       ":bot_default_run",
       ":default_run",
       ":mozilla_run",
+      ":simdjs_run",
       "test262:test262_run",
     ]
   }
 }
 
 ###############################################################################
 # Test groups
 #
 
 group("default_tests") {
@@ skipping 133 matching lines @@
 }
 
 v8_isolate_run("preparser") {
   deps = [
     "..:d8_run",
   ]
 
   isolate = "preparser/preparser.isolate"
 }
 
+v8_isolate_run("simdjs") {
+  deps = [
+    "..:d8_run",
+  ]
+
+  isolate = "simdjs/simdjs.isolate"
+}
+
 v8_isolate_run("unittests") {
   deps = [
     "unittests:unittests",
   ]
 
   isolate = "unittests/unittests.isolate"
 }
 
 v8_isolate_run("webkit") {
   deps = [
     "..:d8_run",
   ]
 
   isolate = "webkit/webkit.isolate"
 }