[llvm] [NFC][AMDGPU] Convert amdpal.ll to autogenerated CHECK lines (PR #141026)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> I think mcpu is tahiti or tonga, may be we can update it? Because I know these are old architecture.

Add more run lines or a separate test 



https://github.com/llvm/llvm-project/pull/141026