New linear scan allocator.

runtime/vm/flow_graph_compiler.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"  // Needed here to get TARGET_ARCH_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
@@ skipping 605 matching lines @@
       loc = Location::RegisterLocation(
         AllocateFreeRegister(blocked_registers));
       locs->set_temp(i, loc);
     }
     SpillRegister(loc.reg());
   }
 
   Location result_location = locs->out();
   if (result_location.IsUnallocated()) {
     switch (result_location.policy()) {
+      case Location::kAny:
+      case Location::kPrefersRegister:
       case Location::kRequiresRegister:
         result_location = Location::RegisterLocation(
             AllocateFreeRegister(blocked_registers));
         break;
       case Location::kSameAsFirstInput:
         result_location = locs->in(0);
         break;
     }
     locs->set_out(result_location);
   }
@@ skipping 156 matching lines @@
       return;
     }
   }
 
   // This move is not blocked.
   EmitMove(index);
 }
 
 
 }  // namespace dart