[clang] [Clang][AST] Add Test Cases for Reference Qualifiers in Opr Overload (PR #102878)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

Here's an example:
https://github.com/llvm/llvm-project/blob/114ff99e93edd699fd94cf2a84de75e8845fc76b/clang/test/CXX/drs/cwg10xx.cpp#L85-L90

https://github.com/llvm/llvm-project/pull/102878