[clang] [llvm] [HLSL] Add `Increment`/`DecrementCounter` methods to structured buffers (PR #114148)

[Greg Roth via cfe-commits]

https://github.com/pow2clk commented:

#113648 is merged. Should probably update the description as I think the corresponding inclusion of ROV buffers went in too.

I haven't finished my review, but I thought I'd get these two points in quickly.

https://github.com/llvm/llvm-project/pull/114148