IR refactoring: consolidate all boxing and unboxing instructions.

runtime/vm/flow_graph_compiler.cc

 // Copyright (c) 2013, 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/bit_vector.h"
 #include "vm/cha.h"
@@ skipping 1479 matching lines @@
     ASSERT(basic_blocks > 0);
     threshold = FLAG_optimization_counter_scale * basic_blocks +
         FLAG_min_optimization_counter_threshold;
     if (threshold > FLAG_optimization_counter_threshold) {
       threshold = FLAG_optimization_counter_threshold;
     }
   }
   return threshold;
 }
 
+
+const Class& FlowGraphCompiler::BoxClassFor(Representation rep) {
+  switch (rep) {
+    case kUnboxedDouble:
+      return double_class();
+    case kUnboxedFloat32x4:
+      return float32x4_class();
+    case kUnboxedFloat64x2:
+      return float64x2_class();
+    case kUnboxedInt32x4:
+      return int32x4_class();
+    case kUnboxedMint:
+      return mint_class();
+    default:
+      UNREACHABLE();
+      return Class::ZoneHandle();
+  }
+}
+
+
 }  // namespace dart