V8: Add SIMD functions.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 1a0a3683b7b5568751aee4310d449549bdc4377c..9c19de4d252baa6a3bcf2f02808e5292ca176fa6 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1636,6 +1636,9 @@ void HeapNumber::HeapNumberPrint(std::ostream& os) {  // NOLINT
 #define READ_INT64_FIELD(p, offset) \
   (*reinterpret_cast<const int64_t*>(FIELD_ADDR_CONST(p, offset)))
 
+#define READ_BYTE_FIELD(p, offset) \
+  (*reinterpret_cast<const byte*>(FIELD_ADDR_CONST(p, offset)))
+
 
 bool Simd128Value::BitwiseEquals(const Simd128Value* other) const {
   return READ_INT64_FIELD(this, kValueOffset) ==
@@ -1659,6 +1662,11 @@ uint32_t Simd128Value::Hash() const {
 }
 
 
+void Simd128Value::CopyBits(void* destination) const {
+  memcpy(destination, &READ_BYTE_FIELD(this, kValueOffset), kSimd128Size);
+}
+
+
 String* JSReceiver::class_name() {
   if (IsJSFunction() || IsJSFunctionProxy()) {
     return GetHeap()->Function_string();