[clang] Adds an arbitrary pseudonym to clang"s windows mangler... (PR #97792)

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memory-thrasher wrote:

> I think this NTTP mangling code needs some significant updates, refactoring, and an increase in test coverage. I see [cd93532](https://github.com/llvm/llvm-project/commit/cd93532dfc455255cb2fa553090d14aaa52b106b) landed last May, probably when I was offline for a while.

Oh for sure. There are 5 other cases in template argument values alone that are still broken, I just made their error messages slightly clearer, at least as to which case is happening. I fixed one specific case I was hitting for my own sake, and am trying to share it but I have little interest in trying to fix the others (for free).

https://github.com/llvm/llvm-project/pull/97792