Make LocalsHandler depend on GraphBuilder instead of SsaBuilder.

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

 // Copyright (c) 2016, 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.
 
+import '../elements/elements.dart';
+import '../types/types.dart';
 import 'nodes.dart';
 
 /// Base class for objects that build up an SSA graph.
 ///
 /// This contains helpers for building the graph and tracking information about
 /// the current state of the graph being built.
 abstract class GraphBuilder {
   /// Holds the resulting SSA graph.
   final HGraph graph = new HGraph();
 
@@ skipping 13 matching lines @@
   /// current block is closed.
   HBasicBlock lastOpenedBlock;
 
   /// Indicates whether the current block is dead (because it has a throw or a
   /// return further up). If this is false, then [current] may be null. If the
   /// block is dead then it may also be aborted, but for simplicity we only
   /// abort on statement boundaries, not in the middle of expressions. See
   /// [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
     // conditional expressions or short-circuit logical operators.
     return block;
   }
 
   void open(HBasicBlock block) {
     block.open();
     current = block;
@@ skipping 29 matching lines @@
   HBasicBlock openNewBlock() {
     HBasicBlock newBlock = addNewBlock();
     if (!isAborted()) goto(current, newBlock);
     open(newBlock);
     return newBlock;
   }
 
   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;
+  }
 }