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

lib/compiler/implementation/ssa/builder.dart

 // 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.
 
 class Interceptors {
   Compiler compiler;
   Interceptors(Compiler this.compiler);
 
   SourceString mapOperatorToMethodName(Operator op) {
     String name = op.source.stringValue;
@@ skipping 511 matching lines @@
     // the next iteration.
     ClosureScope scopeData = closureData.capturingScopes[node];
     if (scopeData == null) return;
     if (scopeData.hasBoxedLoopVariables()) {
       updateCaptureBox(scopeData.boxElement, scopeData.boxedLoopVariables);
     }
   }
 
   void endLoop(HBasicBlock loopEntry) {
     loopEntry.forEachPhi((HPhi phi) {
-      Element element = phi.element;
+      Element element = phi.sourceElement;
       HInstruction postLoopDefinition = directLocals[element];
       phi.addInput(postLoopDefinition);
     });
   }
 
   /**
    * Merge [otherLocals] into this locals handler, creating phi-nodes when
    * there is a conflict.
    * If a phi node is necessary, it will use the otherLocals instruction as the
    * first input, and this handler's instruction as the second.
@@ skipping 1186 matching lines @@
       } else {
         add(new HStaticStore(element, value));
       }
       stack.add(value);
     } else if (element === null || Elements.isInstanceField(element)) {
       HInstruction receiver = generateInstanceSendReceiver(send);
       generateInstanceSetterWithCompiledReceiver(send, receiver, value);
     } else {
       localsHandler.updateLocal(element, value);
       stack.add(value);
+      // If the value does not already have a name, give it here.
+      if (value.sourceElement === null) {
+        value.sourceElement = element;
+      }
     }
   }
 
   visitOperatorSend(node) {
     assert(node.selector is Operator);
     Operator op = node.selector;
     if (const SourceString("[]") == op.source) {
       HStatic target = new HStatic(interceptors.getIndexInterceptor());
       add(target);
       visit(node.receiver);
@@ skipping 1341 matching lines @@
                                         false,
                                         <HInstruction>[target, input]));
     return builder.pop();
   }
 
   HInstruction result() {
     flushLiterals();
     return prefix;
   }
 }