[libcxx-commits] [clang] [libcxx] [Clang] Normalize constraints before checking for satisfaction (PR #161671)

[Arthur Eubanks via libcxx-commits]

aeubanks wrote:

we're still seeing a crash even after the fix like

```
Should not have a NULL template argument
UNREACHABLE executed at ../../clang/lib/AST/TemplateBase.cpp:265!
```

am currently reducing, although it's taking a while to reduce

https://github.com/llvm/llvm-project/pull/161671