[clang] [llvm] [AMDGPU] Add intrinsics for v_[pk]_add_{min|max}_* instructions (PR #164731)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> JBTW, clamp is not clamp either. This is relu, which is not possible to match at all with any sort of input. Clamp bit is again repurposed.

relu? 

https://github.com/llvm/llvm-project/pull/164731