Add support for XMM registers in SSA code generation pipeline.

runtime/vm/assembler_x64_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/os.h"
 #include "vm/unit_test.h"
@@ skipping 1302 matching lines @@
   __ movsd(XMM1, Address(RSP, 0));
   __ movq(R10, RSP);
   __ movsd(Address(R10, 0), XMM1);
   __ movsd(XMM2, Address(R10, 0));
   __ movq(R15, RSP);
   __ movsd(Address(R15, 0), XMM2);
   __ movsd(XMM3, Address(R15, 0));
   __ movq(RAX, RSP);
   __ movsd(Address(RAX, 0), XMM3);
   __ movsd(XMM4, Address(RAX, 0));
-  __ movsd(XMM0, Address(RSP, 0));
+  __ movsd(XMM7, Address(RSP, 0));
+  __ movaps(XMM6, XMM7);
+  __ movaps(XMM5, XMM6);
+  __ movaps(XMM4, XMM5);
+  __ movaps(XMM3, XMM4);
+  __ movaps(XMM2, XMM3);
+  __ movaps(XMM1, XMM2);
+  __ movaps(XMM0, XMM1);
   __ popq(RAX);
   __ popq(R15);  // Callee saved.
   __ ret();
 }
 
 
 ASSEMBLER_TEST_RUN(DoubleFPMoves, entry) {
   typedef double (*DoubleFPMovesCode)();
   EXPECT_FLOAT_EQ(1024.67, reinterpret_cast<DoubleFPMovesCode>(entry)(), 0.001);
 }
@@ skipping 365 matching lines @@
   EXPECT_EQ(0, res);
   res = reinterpret_cast<ExtractSignBits>(entry)(-1.0);
   EXPECT_EQ(1, res);
   res = reinterpret_cast<ExtractSignBits>(entry)(-0.0);
   EXPECT_EQ(1, res);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64