Reapply change to GVN all HFieldGet instructions.

lib/compiler/implementation/ssa/tracer.dart

Index: lib/compiler/implementation/ssa/tracer.dart
diff --git a/lib/compiler/implementation/ssa/tracer.dart b/lib/compiler/implementation/ssa/tracer.dart
index 9ee5d3a57783d07a647ba3768e0dc750233ab466..d8b63435755b42097cbdd40777ee511bd7a16ae6 100644
--- a/lib/compiler/implementation/ssa/tracer.dart
+++ b/lib/compiler/implementation/ssa/tracer.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
@@ -72,10 +72,12 @@ class HTracer extends HGraphVisitor implements Tracer {
          instruction = instruction.next) {
       int bci = 0;
       int uses = instruction.usedBy.length;
+      String changes = instruction.hasSideEffects() ? '!' : ' ';
+      String depends = instruction.dependsOnSomething() ? '?' : '';
       addIndent();
       String temporaryId = stringifier.temporaryId(instruction);
       String instructionString = stringifier.visit(instruction);
-      add("$bci $uses $temporaryId $instructionString <|@\n");
+      add("$bci $uses $temporaryId $instructionString $changes $depends <|@\n");
     }
   }
 
@@ -464,9 +466,10 @@ class HInstructionStringifier implements HVisitor<String> {
     }
     StringBuffer envBuffer = new StringBuffer();
     List<HInstruction> inputs = node.inputs;
-    // The last input is the guarded expression.
-    for (int i = 0; i < inputs.length - 1; i++) {
-      envBuffer.add(" ${temporaryId(inputs[i])}");
+    for (int i = 0; i < inputs.length; i++) {
+      if (inputs[i] !== node.guarded) {
+        envBuffer.add(" ${temporaryId(inputs[i])}");
+      }
     }
     String on = node.isOn ? "on" : "off";
     String id = temporaryId(node.guarded);