Move ReturnInstr to new scheme (x64 and ia32) and implement more code in new ia32 compiler.

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/intermediate_language.h"
 
 namespace dart {
 
@@ skipping 79 matching lines @@
         break;
       case Location::kSameAsFirstInput:
         result_location = in(0);
         break;
     }
     set_out(result_location);
   }
 }
 
 
+LocationSummary* LocationSummary::Make(intptr_t input_count, Location out) {
+  LocationSummary* summary = new LocationSummary(input_count, 0);
+  for (intptr_t i = 0; i < input_count; i++) {
+    summary->set_in(i, Location::RequiresRegister());
+  }
+  summary->set_out(out);
+  return summary;
+}
+
 }  // namespace dart