dart2js cps: Clean up and avoid processing unreachable code.

pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart

Index: pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart
diff --git a/pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart b/pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart
index 4f0be4ad41428b4d8f3bb5a075004aaa377178a1..b4f6dd88014dc0849bca5b55a1970e0bb9326367 100644
--- a/pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart
+++ b/pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart
@@ -63,11 +63,6 @@ class LogicalRewriter extends RecursiveTransformer
 
   final FallthroughStack fallthrough = new FallthroughStack();
 
-  @override
-  void visitInnerFunction(FunctionDefinition node) {
-    new LogicalRewriter().rewrite(node);
-  }
-
   /// True if the given statement is equivalent to its fallthrough semantics.
   ///
   /// This means it will ultimately translate to an empty statement.
@@ -543,9 +538,9 @@ class LogicalRewriter extends RecursiveTransformer
     }
   }
 
-  /// True if [e2] is known to return the same value as [e1] 
+  /// True if [e2] is known to return the same value as [e1]
   /// (with no additional side effects) if evaluated immediately after [e1].
-  /// 
+  ///
   /// Concretely, this is true if [e1] and [e2] are uses of the same variable,
   /// or if [e2] is a use of a variable assigned by [e1].
   bool isSameVariable(Expression e1, Expression e2) {