[llvm] [AMDGPU] promote i1 arg type for amdgpu_cs (PR #82971)

[Diana Picus via llvm-commits]

rovka wrote:

Hi, while you're at it, could you please make the same change for [`amdgpu_cs_chain` and `amdgpu_cs_chain_preserve`](https://github.com/llvm/llvm-project/blob/6c7aee0ba51a45dc387d7da6723857bba0c5587c/llvm/lib/Target/AMDGPU/AMDGPUCallingConv.td#L227)? 

https://github.com/llvm/llvm-project/pull/82971