Make default_parameter_values a ZoneGrowableArray instead of an array in new space

runtime/vm/flow_graph_compiler_mips.cc

Index: runtime/vm/flow_graph_compiler_mips.cc
diff --git a/runtime/vm/flow_graph_compiler_mips.cc b/runtime/vm/flow_graph_compiler_mips.cc
index 44fcaab6e3e0a7151d19e3b824e74f85ffaf9ed3..b3954d591ab5b57b6fc117b7ef373571728bac89 100644
--- a/runtime/vm/flow_graph_compiler_mips.cc
+++ b/runtime/vm/flow_graph_compiler_mips.cc
@@ -880,9 +880,8 @@ void FlowGraphCompiler::CopyParameters() {
 
       __ Bind(&load_default_value);
       // Load T3 with default argument.
-      const Object& value = Object::ZoneHandle(zone(),
-          parsed_function().default_parameter_values().At(
-              param_pos - num_fixed_params));
+      const Instance& value =
+          parsed_function().DefaultParameterAt(param_pos - num_fixed_params);
       __ LoadObject(T3, value);
       __ Bind(&assign_optional_parameter);
       // Assign T3 to fp[kFirstLocalSlotFromFp - param_pos].
@@ -914,8 +913,7 @@ void FlowGraphCompiler::CopyParameters() {
       const int param_pos = num_fixed_params + i;
       __ BranchSignedGreater(T2, Immediate(param_pos), &next_parameter);
       // Load T3 with default argument.
-      const Object& value = Object::ZoneHandle(zone(),
-          parsed_function().default_parameter_values().At(i));
+      const Object& value = parsed_function().DefaultParameterAt(i);
       __ LoadObject(T3, value);
       // Assign T3 to fp[kFirstLocalSlotFromFp - param_pos].
       // We do not use the final allocation index of the variable here, i.e.