Add support for XMM registers in SSA code generation pipeline.

runtime/vm/assembler_x64.cc

Index: runtime/vm/assembler_x64.cc
diff --git a/runtime/vm/assembler_x64.cc b/runtime/vm/assembler_x64.cc
index 84cf9697138fa3d367c4974168cda2a1d7b7802d..bc213eb74b1a16b3f3945b80d9bcb3a2e6847705 100644
--- a/runtime/vm/assembler_x64.cc
+++ b/runtime/vm/assembler_x64.cc
@@ -479,6 +479,17 @@ void Assembler::movsd(XmmRegister dst, XmmRegister src) {
 }
 
 
+void Assembler::movaps(XmmRegister dst, XmmRegister src) {
+  // TODO(vegorov): implement and test XMM8 - XMM15.
+  ASSERT(src <= XMM7);
+  ASSERT(dst <= XMM7);
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x0F);
+  EmitUint8(0x28);
+  EmitXmmRegisterOperand(dst & 7, src);
+}
+
+
 void Assembler::addsd(XmmRegister dst, XmmRegister src) {
   // TODO(srdjan): implement and test XMM8 - XMM15.
   ASSERT(src <= XMM7);
@@ -1921,6 +1932,17 @@ const char* Assembler::RegisterName(Register reg) {
 }
 
 
+static const char* xmm_reg_names[kNumberOfXmmRegisters] = {
+  "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7"
+};
+
+
+const char* Assembler::XmmRegisterName(XmmRegister reg) {
+  ASSERT((0 <= reg) && (reg < kNumberOfXmmRegisters));
+  return xmm_reg_names[reg];
+}
+
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64