Tests failing (for the opaque pointers?)

This may be related to #1732 and probably #687

The `ninja check-enzyme` fails as follows (too many to copy paste, unless you really want the list from me)

```
Testing Time: 3.74s

Total Discovered Tests: 940
Passed : 303 (32.23%)
Expectedly Failed: 9 (0.96%)
Failed : 628 (66.81%)
```

The `ninja check-enzyme-integration` might be unrelated, but reporting here too nevertheless, since the list is small and I don't think it's worth another ticket (it may be yours truly's error)

```
Failed Tests (18):
Enzyme :: Integration/ForwardError/eigen.cpp
Enzyme :: Integration/ForwardMode/eigen.cpp
Enzyme :: Integration/ReverseMode/eigensumsq.cpp
Enzyme :: Integration/ReverseMode/eigensumsqdyn-notmp.cpp
Enzyme :: Integration/ReverseMode/eigensumsqdyn.cpp
Enzyme :: Integration/ReverseMode/eigentensor.cpp
Enzyme :: Integration/ReverseMode/eigentensorfull.cpp
Enzyme :: Integration/ReverseMode/eigentensorreal.cpp
Enzyme :: Integration/ReverseMode/simpleeigen-made-part.cpp
Enzyme :: Integration/ReverseMode/simpleeigen-made.cpp
Enzyme :: Integration/ReverseMode/simpleeigen.cpp
Enzyme :: Integration/ReverseMode/simpleeigenstatic-made-odd.cpp
Enzyme :: Integration/ReverseMode/simpleeigenstatic-made.cpp
Enzyme :: Integration/ReverseMode/simpleeigenstatic-sum.cpp
Enzyme :: Integration/ReverseMode/simpleeigenstatic-sumsq.cpp
Enzyme :: Integration/ReverseMode/simpleeigenstatic-vec.cpp
Enzyme :: Integration/ReverseMode/simpleeigenstatic.cpp
Enzyme :: Integration/Truncate/simple.cpp

Testing Time: 35.68s

Total Discovered Tests: 146
Passed : 123 (84.25%)
Expectedly Failed: 5 (3.42%)
Failed : 18 (12.33%)
```