Make default_parameter_values a ZoneGrowableArray instead of an array in new space

runtime/vm/unit_test.cc

Index: runtime/vm/unit_test.cc
diff --git a/runtime/vm/unit_test.cc b/runtime/vm/unit_test.cc
index 8bcd27124785c517058e8eae041396e2d3b97742..421bbdcabc4444d2d9d233ad169b270a9f9a4598 100644
--- a/runtime/vm/unit_test.cc
+++ b/runtime/vm/unit_test.cc
@@ -222,7 +222,7 @@ CodeGenTest::CodeGenTest(const char* name)
   : function_(Function::ZoneHandle()),
     node_sequence_(new SequenceNode(Scanner::kNoSourcePos,
                                     new LocalScope(NULL, 0, 0))),
-    default_parameter_values_(Array::ZoneHandle()) {
+    default_parameter_values_(new ZoneGrowableArray<const Instance*> ()) {
   ASSERT(name != NULL);
   const String& function_name = String::ZoneHandle(Symbols::New(name));
   // Add function to a class and that class to the class dictionary so that