Cleanups and preemptively pass Heap::kOld whenever subtype testing in compiler

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
diff --git a/runtime/vm/intermediate_language.cc b/runtime/vm/intermediate_language.cc
index 029cddb39a1b43240e7e7b28348b06f4eb1229bd..e2d1ad86e7fec2fd0fea9a18d4960aebf37c1712 100644
--- a/runtime/vm/intermediate_language.cc
+++ b/runtime/vm/intermediate_language.cc
@@ -2033,7 +2033,8 @@ Definition* AssertAssignableInstr::Canonicalize(FlowGraph* flow_graph) {
         TypeArguments::Cast(constant_type_args->value());
     Error& bound_error = Error::Handle();
     const AbstractType& new_dst_type = AbstractType::Handle(
-        dst_type().InstantiateFrom(instantiator_type_args, &bound_error));
+        dst_type().InstantiateFrom(
+            instantiator_type_args, &bound_error, NULL, Heap::kOld));
     // If dst_type is instantiated to dynamic or Object, skip the test.
     if (!new_dst_type.IsMalformedOrMalbounded() && bound_error.IsNull() &&
         (new_dst_type.IsDynamicType() || new_dst_type.IsObjectType())) {
@@ -2318,7 +2319,7 @@ static bool MayBeBoxableNumber(intptr_t cid) {
 
 static bool MaybeNumber(CompileType* type) {
   ASSERT(Type::Handle(Type::Number()).IsMoreSpecificThan(
-         Type::Handle(Type::Number()), NULL));
+         Type::Handle(Type::Number()), NULL, Heap::kOld));
   return type->ToAbstractType()->IsDynamicType()
       || type->ToAbstractType()->IsObjectType()
       || type->ToAbstractType()->IsTypeParameter()