[clang] [clang] Allow pack expansions when partial ordering against template template parameters (PR #91833)

[via cfe-commits]

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@@ -707,6 +707,7 @@ Bug Fixes to C++ Support
   initialized, rather than evaluating them as a part of the larger manifestly constant evaluated
   expression.
 - Fix a bug in access control checking due to dealyed checking of friend declaration. Fixes (#GH12361).
+- When partial ordering alias templates against template template parameters, allow pack expansions when the alias has a fixed-size parameter list. Fixes (#GH62529).
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cor3ntin wrote:

```suggestion
- When partial ordering alias templates against template template parameters, 
   allow pack expansions when the alias has a fixed-size parameter list. Fixes (#GH62529).
```

https://github.com/llvm/llvm-project/pull/91833