[llvm] [SPIRV][NFCI] Refactor selection of atomic operations with pointer operands (PR #208294)

[Juan Manuel Martinez Caamaño via llvm-commits]

jmmartinez wrote:

> @jmmartinez Hopefully this is similar to what you were thinking

Sorry I'm taking some time. I have it on my queue. I'll try to get to it ASAP.

https://github.com/llvm/llvm-project/pull/208294