Add support for XMM registers in SSA code generation pipeline.

runtime/vm/assembler_macros_x64.cc

Index: runtime/vm/assembler_macros_x64.cc
diff --git a/runtime/vm/assembler_macros_x64.cc b/runtime/vm/assembler_macros_x64.cc
index b2b27f8577622d8e179360d383c80ed91358a8f9..fc01baf5836f423c0bbd620dab0a9fb8ec869b6c 100644
--- a/runtime/vm/assembler_macros_x64.cc
+++ b/runtime/vm/assembler_macros_x64.cc
@@ -19,6 +19,7 @@ DECLARE_FLAG(bool, inline_alloc);
 void AssemblerMacros::TryAllocate(Assembler* assembler,
                                   const Class& cls,
                                   Label* failure,
+                                  bool near_jump,
                                   Register instance_reg) {
   ASSERT(failure != NULL);
   if (FLAG_inline_alloc) {
@@ -30,7 +31,7 @@ void AssemblerMacros::TryAllocate(Assembler* assembler,
     // instance_reg: potential next object start.
     __ movq(TMP, Immediate(heap->EndAddress()));
     __ cmpq(instance_reg, Address(TMP, 0));
-    __ j(ABOVE_EQUAL, failure, Assembler::kNearJump);
+    __ j(ABOVE_EQUAL, failure, near_jump);
     // Successfully allocated the object, now update top to point to
     // next object start and store the class in the class field of object.
     __ movq(TMP, Immediate(heap->TopAddress()));