Make LocalsHandler depend on GraphBuilder instead of SsaBuilder.

pkg/compiler/lib/src/ssa/graph_builder.dart

Index: pkg/compiler/lib/src/ssa/graph_builder.dart
diff --git a/pkg/compiler/lib/src/ssa/graph_builder.dart b/pkg/compiler/lib/src/ssa/graph_builder.dart
index 9da63208c2044172a5841a8c2d695b884f1eb75e..969899f617e6e1032d0ca4031d2e56906a95b95d 100644
--- a/pkg/compiler/lib/src/ssa/graph_builder.dart
+++ b/pkg/compiler/lib/src/ssa/graph_builder.dart
@@ -2,6 +2,8 @@
 // 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.
 
+import '../elements/elements.dart';
+import '../types/types.dart';
 import 'nodes.dart';
 
 /// Base class for objects that build up an SSA graph.
@@ -35,6 +37,11 @@ abstract class GraphBuilder {
   /// [isAborted].
   bool isReachable = true;
 
+  HParameterValue lastAddedParameter;
+
+  Map<ParameterElement, HInstruction> parameters =
+      <ParameterElement, HInstruction>{};
+
   HBasicBlock addNewBlock() {
     HBasicBlock block = graph.addNewBlock();
     // If adding a new block during building of an expression, it is due to
@@ -84,4 +91,15 @@ abstract class GraphBuilder {
   void add(HInstruction instruction) {
     current.add(instruction);
   }
+
+  HParameterValue addParameter(Entity parameter, TypeMask type) {
+    HParameterValue result = new HParameterValue(parameter, type);
+    if (lastAddedParameter == null) {
+      graph.entry.addBefore(graph.entry.first, result);
+    } else {
+      graph.entry.addAfter(lastAddedParameter, result);
+    }
+    lastAddedParameter = result;
+    return result;
+  }
 }