Add support for XMM registers in SSA code generation pipeline.

runtime/vm/locations.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/locations.h"
 
 #include "vm/il_printer.h"
 #include "vm/intermediate_language.h"
 #include "vm/flow_graph_compiler.h"
 
@@ skipping 31 matching lines @@
   }
   summary->set_out(out);
   return summary;
 }
 
 
 const char* Location::Name() const {
   switch (kind()) {
     case kInvalid: return "?";
     case kRegister: return Assembler::RegisterName(reg());
+    case kXmmRegister: return Assembler::XmmRegisterName(xmm_reg());
     case kStackSlot: return "S";
     case kUnallocated:
       switch (policy()) {
         case kAny:
           return "A";
         case kPrefersRegister:
           return "P";
         case kRequiresRegister:
           return "R";
+        case kRequiresXmmRegister:
+          return "D";
         case kSameAsFirstInput:
           return "0";
       }
       UNREACHABLE();
     default:
       ASSERT(IsConstant());
       return "C";
   }
   return "?";
 }
@@ skipping 38 matching lines @@
 
   if (!out().IsInvalid()) {
     f->Print(" => ");
     out().PrintTo(f);
   }
 
   if (always_calls()) f->Print(" C");
 }
 
 }  // namespace dart