dart2js cps: Direct access on JS arrays.

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 be59dc90692297fe4217949f62c5415defa83806..8c7a5af2e3cf161e2b3334bfcbc1e211f06c5348 100644
--- a/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
+++ b/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
@@ -350,6 +350,7 @@ class StatementRewriter extends Transformer implements Pass {
     return exp is Constant ||
            exp is This ||
            exp is CreateInvocationMirror ||
+           exp is GetStatic && exp.element.isFunction ||
            exp is Interceptor ||
            exp is ApplyBuiltinOperator ||
            exp is VariableUse && constantEnvironment.containsKey(exp.variable);
@@ -717,6 +718,24 @@ class StatementRewriter extends Transformer implements Pass {
     return node;
   }
 
+  Expression visitGetLength(GetLength node) {
+    node.object = visitExpression(node.object);
+    return node;
+  }
+
+  Expression visitGetIndex(GetIndex node) {
+    node.index = visitExpression(node.index);
+    node.object = visitExpression(node.object);
+    return node;
+  }
+
+  Expression visitSetIndex(SetIndex node) {
+    node.value = visitExpression(node.value);
+    node.index = visitExpression(node.index);
+    node.object = visitExpression(node.object);
+    return node;
+  }
+
   /// True if [operator] is a binary operator that always has the same value
   /// if its arguments are swapped.
   bool isSymmetricOperator(BuiltinOperator operator) {