[ntuple] fix type names with [U]Long64_t template args

Custom classes with [U]Long64_t template arguments need to use their
meta-normalized name as type alias. Otherwise, during reconstruction
with the RNTuple normalized name, the streamer info for the
`std::[u]int64_t` argument will be requested (typically `long`
instead of `long long`).

Author: jblomer

tree/ntuple/src/RFieldMeta.cxx

@@ -158,6 +158,10 @@ ROOT::RClassField::RClassField(std::string_view fieldName, TClass *classp)
    if (!(fClass->ClassProperty() & kClassHasExplicitDtor))
       fTraits |= kTraitTriviallyDestructible;
 
+   std::string renormalizedAlias;
+   if (Internal::NeedsMetaNameAsAlias(classp->GetName(), renormalizedAlias))
+      fTypeAlias = renormalizedAlias;
+
    int i = 0;
    const auto *bases = fClass->GetListOfBases();
    assert(bases);

tree/ntuple/test/CustomStruct.hxx

@@ -100,6 +100,10 @@ struct alignas(std::uint64_t) TestEBO : public EmptyStruct {
 template <typename T>
 class EdmWrapper {
 public:
+   struct Inner {
+      T fX;
+   };
+
    bool fIsPresent = true;
    T fMember;
 };

tree/ntuple/test/rfield_class.cxx

@@ -407,6 +407,8 @@ TEST(RNTuple, StreamerInfoRecords)
       {"DerivedA", {"DerivedA", "CustomStruct"}},
       {"std::pair<CustomStruct, DerivedA>", {"DerivedA", "CustomStruct"}},
       {"EdmWrapper<long long>", {"EdmWrapper<Long64_t>"}},
+      {"EdmContainer", {"EdmContainer", "EdmWrapper<Long64_t>"}},
+      {"EdmWrapper<long long>::Inner", {"EdmWrapper<Long64_t>::Inner"}},
       {"TRotation", {"TRotation"}}};
 
    for (const auto &t : testees) {
@@ -436,5 +438,11 @@ TEST(RNTuple, StreamerInfoRecords)
          expectedInfos.erase(itr);
       }
       EXPECT_TRUE(expectedInfos.empty());
+
+      // Make sure we can reconstruct the fields
+      auto reader = RNTupleReader::Open("ntpl", fileGuard.GetPath());
+      if (auto field = dynamic_cast<const ROOT::RClassField *>(&reader->GetModel().GetConstField("f"))) {
+         EXPECT_EQ(t.second[0], field->GetClass()->GetName());
+      }
    }
 }