[llvm] [AMDGPU] s_monitor_sleep shall not use sleep_forever on gfx1250 (PR #220366)

[Krzysztof Drewniak via llvm-commits]

https://github.com/krzysz00 commented:

Presuming that this clamping is what we want to do, code looks fine

https://github.com/llvm/llvm-project/pull/220366