[clang] [Clang] Supports dollars in UDLs (PR #208490)

[Aaron Ballman via cfe-commits]

================
@@ -0,0 +1,17 @@
+// RUN: %clang_cc1 -std=c++20 -Wno-user-defined-literals
----------------
AaronBallman wrote:

```suggestion
// RUN: %clang_cc1 -std=c++20 -Wno-user-defined-literals %s
```
:-D

https://github.com/llvm/llvm-project/pull/208490