Add the ability to run tests with several sets of VM flags

runtime/tests/dart/src/ProcessStderrTest.dart

Index: runtime/tests/dart/src/ProcessStderrTest.dart
diff --git a/runtime/tests/dart/src/ProcessStderrTest.dart b/runtime/tests/dart/src/ProcessStderrTest.dart
index e92ded255b1300f9f34a828c4e99d838b9ad5088..797dc13a4e2e88683ef4014eaf4a42dc40a63683 100644
--- a/runtime/tests/dart/src/ProcessStderrTest.dart
+++ b/runtime/tests/dart/src/ProcessStderrTest.dart
@@ -3,6 +3,11 @@
 // BSD-style license that can be found in the LICENSE file.
 //
 // Process test program to test process communication.
+//
+// VMOptions=
+// VMOptions=--short_socket_read
+// VMOptions=--short_socket_write
+// VMOptions=--short_socket_read --short_socket_write
 
 class ProcessStderrTest {
 
@@ -32,7 +37,7 @@ class ProcessStderrTest {
         process.close();
       }
 
-      bool read = input.read(readBuffer, 0, BUFFERSIZE, readData); 
+      bool read = input.read(readBuffer, 0, BUFFERSIZE, readData);
       if (read) {
         readData();
       }