[clang] [llvm] [SPIRV] Add Target Builtins using Distance ext as an example (PR #121598)

[Farzon Lotfi via llvm-commits]

farzonl wrote:

@Endilll It looks like you are the code owner for `/clang/include/clang/Sema/Sema.h` Are you happy with these changes?

https://github.com/llvm/llvm-project/pull/121598