[clang] [DirectX] Fix HLSL bitshifts to leverage the OpenCL pipeline for bitshifting (PR #81030)

[Chris B via cfe-commits]

llvm-beanz wrote:

The bot failure looks like an unrelated CMake issue on Windows. I think we've seen that around a few times. I'll merge this now.

https://github.com/llvm/llvm-project/pull/81030