TypeIdentifier: Preserve container types

Pass-through-types turn classes into containers. We don't want these to
turn into Dummy's on a second run of TypeIdentifier.

Author: ajor

oi/type_graph/TypeIdentifier.cpp

@@ -61,7 +61,8 @@ void TypeIdentifier::visit(Container& c) {
   for (size_t i = 0; i < c.templateParams.size(); i++) {
     const auto& param = c.templateParams[i];
     if (dynamic_cast<Dummy*>(param.type()) ||
-        dynamic_cast<DummyAllocator*>(param.type())) {
+        dynamic_cast<DummyAllocator*>(param.type()) ||
+        dynamic_cast<Container*>(param.type())) {
       // In case the TypeIdentifier pass is run multiple times, we don't want to
       // replace dummies again as the context of the original replacement has
       // been lost.

test/test_type_identifier.cpp

@@ -177,7 +177,9 @@ TEST(TypeIdentifierTest, ContainerNotReplaced) {
       Param
         Primitive: int32_t
       Param
-        Dummy (size: 0, align: 8)
+[1]     Container: std::allocator (size: 1)
+          Param
+            Primitive: int32_t
 )");
 }