dart2js cps: Fix traversal order in statement rewriter.

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

Index: pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
diff --git a/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart b/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
index f23533ccfbd76f55a87656df2921e21a360ed9b0..1c96301711577753d98346431fcc4e8fb7d3cc06 100644
--- a/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
+++ b/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
@@ -579,13 +579,11 @@ class StatementRewriter extends Transformer implements Pass {
   }
 
   Expression visitLogicalOperator(LogicalOperator node) {
-    node.left = visitExpression(node.left);
-
     // Impure expressions may not propagate across the branch.
     inEmptyEnvironment(() {
       node.right = visitExpression(node.right);
     });
-
+    node.left = visitExpression(node.left);
     return node;
   }
 
@@ -1244,8 +1242,8 @@ class StatementRewriter extends Transformer implements Pass {
 
   @override
   Statement visitYield(Yield node) {
-    node.input = visitExpression(node.input);
     node.next = visitStatement(node.next);
+    node.input = visitExpression(node.input);
     return node;
   }