Unify handling of position info in AST, part 1

src/rewriter.cc

Index: src/rewriter.cc
diff --git a/src/rewriter.cc b/src/rewriter.cc
index 06335a80c7b38e658d78414f76a8a3c0a6a6d726..4db4a3054ea3d80eb3ac3e1da59041008cf2a095 100644
--- a/src/rewriter.cc
+++ b/src/rewriter.cc
@@ -271,13 +271,12 @@ bool Rewriter::Rewrite(CompilationInfo* info) {
       //   eval('with ({x:1}) x = 1');
       // the end position of the function generated for executing the eval code
       // coincides with the end of the with scope which is the position of '1'.
-      int position = function->end_position();
+      int pos = function->end_position();
       VariableProxy* result_proxy = processor.factory()->NewVariableProxy(
-          result->name(), false, result->interface(), position);
+          result->name(), false, result->interface(), pos);
       result_proxy->BindTo(result);
       Statement* result_statement =
-          processor.factory()->NewReturnStatement(result_proxy);
-      result_statement->set_statement_pos(position);
+          processor.factory()->NewReturnStatement(result_proxy, pos);
       body->Add(result_statement, info->zone());
     }
   }