Revert of Remove SIMD.js from V8.

test/cctest/test-heap-profiler.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 460 matching lines @@
       GetProperty(global, v8::HeapGraphEdge::kProperty, "a");
   CHECK(a);
   CHECK_EQ(a->GetType(), v8::HeapGraphNode::kSymbol);
   CHECK(v8_str("symbol")->Equals(env.local(), a->GetName()).FromJust());
   const v8::HeapGraphNode* name =
       GetProperty(a, v8::HeapGraphEdge::kInternal, "name");
   CHECK(name);
   CHECK(v8_str("mySymbol")->Equals(env.local(), name->GetName()).FromJust());
 }
 
+
+void CheckSimdSnapshot(const char* program, const char* var_name) {
+  i::FLAG_harmony_simd = true;
+  LocalContext env;
+  v8::HandleScope scope(env->GetIsolate());
+  v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
+
+  CompileRun(program);
+  // The TakeHeapSnapshot function does not do enough GCs to ensure
+  // that all garbage is collected. We perform addition GC here
+  // to reclaim a floating AllocationSite and to fix the following failure:
+  // # Check failed: ValidateSnapshot(snapshot).
+  // Stdout:
+  //     28 @ 13523   entry with no retainer: /hidden/ system / AllocationSite
+  //     44 @   767    $map: /hidden/ system / Map
+  //     44 @    59      $map: /hidden/ system / Map
+  CcTest::CollectAllGarbage(i::Heap::kFinalizeIncrementalMarkingMask);
+
+  const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
+  CHECK(ValidateSnapshot(snapshot));
+  const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
+  const v8::HeapGraphNode* var =
+      GetProperty(global, v8::HeapGraphEdge::kProperty, var_name);
+  CHECK(var);
+  CHECK_EQ(var->GetType(), v8::HeapGraphNode::kSimdValue);
+}
+
+
+TEST(HeapSnapshotSimd) {
+  CheckSimdSnapshot("a = SIMD.Float32x4();\n", "a");
+  CheckSimdSnapshot("a = SIMD.Int32x4();\n", "a");
+  CheckSimdSnapshot("a = SIMD.Uint32x4();\n", "a");
+  CheckSimdSnapshot("a = SIMD.Bool32x4();\n", "a");
+  CheckSimdSnapshot("a = SIMD.Int16x8();\n", "a");
+  CheckSimdSnapshot("a = SIMD.Uint16x8();\n", "a");
+  CheckSimdSnapshot("a = SIMD.Bool16x8();\n", "a");
+  CheckSimdSnapshot("a = SIMD.Int8x16();\n", "a");
+  CheckSimdSnapshot("a = SIMD.Uint8x16();\n", "a");
+  CheckSimdSnapshot("a = SIMD.Bool8x16();\n", "a");
+}
+
+
 TEST(HeapSnapshotWeakCollection) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
 
   CompileRun(
       "k = {}; v = {}; s = 'str';\n"
       "ws = new WeakSet(); ws.add(k); ws.add(v); ws[s] = s;\n"
       "wm = new WeakMap(); wm.set(k, v); wm[s] = s;\n");
   const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
@@ skipping 2493 matching lines @@
       "      a[i] = i;\n"
       "  for (var i = 0; i < 3; ++i)\n"
       "      a.shift();\n"
       "}\n");
 
   CcTest::CollectGarbage(v8::internal::NEW_SPACE);
   // Should not crash.
 
   heap_profiler->StopSamplingHeapProfiler();
 }