Handle stdio redirection in standalone VM

runtime/bin/process_impl.dart

Index: runtime/bin/process_impl.dart
diff --git a/runtime/bin/process_impl.dart b/runtime/bin/process_impl.dart
index 82ccc64d9ded31f78c0c6d1217f5036efb3e2c54..f9eb9f4d133bb6b338543fc3f3ae8741953b99db 100644
--- a/runtime/bin/process_impl.dart
+++ b/runtime/bin/process_impl.dart
@@ -85,10 +85,10 @@ class _Process implements Process {
 
     // Setup an exit handler to handle internal cleanup and possible
     // callback when a process terminates.
+    int exitDataRead = 0;
+    final int EXIT_DATA_SIZE = 8;
+    List<int> exitDataBuffer = new List<int>(EXIT_DATA_SIZE);
     _exitHandler.inputStream.dataHandler = () {
-      final int EXIT_DATA_SIZE = 8;
-      List<int> exitDataBuffer = new List<int>(EXIT_DATA_SIZE);
-      int exitDataRead = 0;
 
       int exitCode(List<int> ints) {
         var code = _intFromBytes(ints, 0);