Revert "Address code review comments on r19350"

sdk/lib/_internal/compiler/implementation/ssa/optimize.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/optimize.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/optimize.dart b/sdk/lib/_internal/compiler/implementation/ssa/optimize.dart
index 28693010d888670760939971cecce1f51d4bec2b..7a41583029fa382f8aed202446162e1da390dbf4 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/optimize.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/optimize.dart
@@ -598,21 +598,22 @@ class SsaConstantFolder extends HBaseVisitor implements OptimizationPhase {
     if (field == null) return node;
 
     Modifiers modifiers = field.modifiers;
-    bool isAssignable = !(modifiers.isFinal() || modifiers.isConst());
+    bool isFinalOrConst = modifiers.isFinal() || modifiers.isConst();
     if (!compiler.resolverWorld.hasInvokedSetter(field, compiler)) {
       // If no setter is ever used for this field it is only initialized in the
       // initializer list.
-      isAssignable = false;
+      isFinalOrConst = true;
     }
+    HFieldGet result = new HFieldGet(
+        field, node.inputs[0], isAssignable: !isFinalOrConst);
+
+    // Some native fields are views of data that may be changed by operations.
+    // E.g. node.firstChild depends on parentNode.removeBefore(n1, n2).
+    // TODO(sra): Refine the effect classification so that native effects are
+    // distinct from ordinary Dart effects.
     if (field.isNative()) {
-      // Some native fields are views of data that may be changed by operations.
-      // E.g. node.firstChild depends on parentNode.removeBefore(n1, n2).
-      // TODO(sra): Refine the effect classification so that native effects are
-      // distinct from ordinary Dart effects.
-      isAssignable = true;
+      result.setDependsOnSomething();
     }
-    HFieldGet result = new HFieldGet(
-        field, node.inputs[0], isAssignable: isAssignable);
 
     if (field.getEnclosingClass().isNative()) {
       result.instructionType =