Give a sourceElement to SSA instructions so that if they end up being 'define' in the codegen (ie n…

lib/compiler/implementation/ssa/nodes.dart

 // Copyright (c) 2011, 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.
 
 interface HVisitor<R> {
   R visitAdd(HAdd node);
   R visitBitAnd(HBitAnd node);
   R visitBitNot(HBitNot node);
   R visitBitOr(HBitOr node);
   R visitBitXor(HBitXor node);
@@ skipping 716 matching lines @@
   }
 
   HType combine(HType other) {
     if (isUnknown()) return other;
     if (other.isUnknown()) return this;
     return getTypeFromFlag(this.flag & other.flag);
   }
 }
 
 class HInstruction implements Hashable {
+  Element sourceElement;
+
   final int id;
   static int idCounter;
 
   final List<HInstruction> inputs;
   final List<HInstruction> usedBy;
 
   HBasicBlock block;
   HInstruction previous = null;
   HInstruction next = null;
   int flags = 0;
@@ skipping 1011 matching lines @@
   bool isCodeMotionInvariant() => true;
 }
 
 class HThis extends HParameterValue {
   HThis() : super(null);
   toString() => 'this';
   accept(HVisitor visitor) => visitor.visitThis(this);
 }
 
 class HPhi extends HInstruction {
-  final Element element;
-
   static final IS_NOT_LOGICAL_OPERATOR = 0;
   static final IS_AND = 1;
   static final IS_OR = 2;
 
   int logicalOperatorType = IS_NOT_LOGICAL_OPERATOR;
 
   // The order of the [inputs] must correspond to the order of the
   // predecessor-edges. That is if an input comes from the first predecessor
   // of the surrounding block, then the input must be the first in the [HPhi].
-  HPhi(this.element, List<HInstruction> inputs) : super(inputs);
+  HPhi(Element element, List<HInstruction> inputs) : super(inputs) {
+    sourceElement = element;
+  }
   HPhi.noInputs(Element element) : this(element, <HInstruction>[]);
   HPhi.singleInput(Element element, HInstruction input)
       : this(element, <HInstruction>[input]);
   HPhi.manyInputs(Element element, List<HInstruction> inputs)
       : this(element, inputs);
 
   void addInput(HInstruction input) {
     assert(isInBasicBlock());
     inputs.add(input);
     input.usedBy.add(this);
@@ skipping 466 matching lines @@
   final bool isAnd;
   final SubExpression left;
   final SubExpression right;
   final HBasicBlock joinBlock;
   HAndOrBlockInformation(this.isAnd,
                          this.left,
                          this.right,
                          this.joinBlock);
   bool accept(HBlockInformationVisitor visitor) => visitor.visitAndOrInfo(this);
 }