[clang] [CIR][NVPTX] Handle CUDALaunchBoundsAttr (PR #216447)

[David Rivera via cfe-commits]

RiverDave wrote:

> This is a faithful port. Thank you!
> 
> Many lines between OGCG and LLVM are identical, can we just merge them, instead of having them twice.

will do

https://github.com/llvm/llvm-project/pull/216447