Refactor StatementRewriter: Extract method for rewriting a list left-to-right.

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 643aeb23c285b5a6e919b9dc0ff315188abad885..7b79cfd67b77b7e0adf254554efaefb6ae54b21d 100644
--- a/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
+++ b/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
@@ -343,41 +343,38 @@ class StatementRewriter extends Transformer implements Pass {
     return node;
   }
 
-  Expression visitInvokeStatic(InvokeStatic node) {
-    // Process arguments right-to-left, the opposite of evaluation order.
-    for (int i = node.arguments.length - 1; i >= 0; --i) {
-      node.arguments[i] = visitExpression(node.arguments[i]);
+  /// Process nodes right-to-left, the opposite of evaluation order in the case
+  /// of argument lists..
+  void _rewriteList(List<Node> nodes) {
+    for (int i = nodes.length - 1; i >= 0; --i) {
+      nodes[i] = visitExpression(nodes[i]);
     }
+  }
+
+  Expression visitInvokeStatic(InvokeStatic node) {
+    _rewriteList(node.arguments);
     return node;
   }
 
   Expression visitInvokeMethod(InvokeMethod node) {
-    for (int i = node.arguments.length - 1; i >= 0; --i) {
-      node.arguments[i] = visitExpression(node.arguments[i]);
-    }
+    _rewriteList(node.arguments);
     node.receiver = visitExpression(node.receiver);
     return node;
   }
 
   Expression visitInvokeMethodDirectly(InvokeMethodDirectly node) {
-    for (int i = node.arguments.length - 1; i >= 0; --i) {
-      node.arguments[i] = visitExpression(node.arguments[i]);
-    }
+    _rewriteList(node.arguments);
     node.receiver = visitExpression(node.receiver);
     return node;
   }
 
   Expression visitInvokeConstructor(InvokeConstructor node) {
-    for (int i = node.arguments.length - 1; i >= 0; --i) {
-      node.arguments[i] = visitExpression(node.arguments[i]);
-    }
+    _rewriteList(node.arguments);
     return node;
   }
 
   Expression visitConcatenateStrings(ConcatenateStrings node) {
-    for (int i = node.arguments.length - 1; i >= 0; --i) {
-      node.arguments[i] = visitExpression(node.arguments[i]);
-    }
+    _rewriteList(node.arguments);
     return node;
   }
 
@@ -561,10 +558,7 @@ class StatementRewriter extends Transformer implements Pass {
   }
 
   Expression visitLiteralList(LiteralList node) {
-    // Process values right-to-left, the opposite of evaluation order.
-    for (int i = node.values.length - 1; i >= 0; --i) {
-      node.values[i] = visitExpression(node.values[i]);
-    }
+    _rewriteList(node.values);
     return node;
   }
 
@@ -607,9 +601,7 @@ class StatementRewriter extends Transformer implements Pass {
   }
 
   Expression visitCreateInstance(CreateInstance node) {
-    for (int i = node.arguments.length - 1; i >= 0; --i) {
-      node.arguments[i] = visitExpression(node.arguments[i]);
-    }
+    _rewriteList(node.arguments);
     return node;
   }
 
@@ -624,16 +616,12 @@ class StatementRewriter extends Transformer implements Pass {
   }
 
   Expression visitTypeExpression(TypeExpression node) {
-    for (int i = node.arguments.length - 1; i >= 0; --i) {
-      node.arguments[i] = visitExpression(node.arguments[i]);
-    }
+    _rewriteList(node.arguments);
     return node;
   }
 
   Expression visitCreateInvocationMirror(CreateInvocationMirror node) {
-    for (int i = node.arguments.length - 1; i >= 0; --i) {
-      node.arguments[i] = visitExpression(node.arguments[i]);
-    }
+    _rewriteList(node.arguments);
     return node;
   }