[llvm] [AMDGPU][GlobalISel] Enable kernel argument preloading (PR #134655)

[Austin Kerbow via llvm-commits]

https://github.com/kerbowa commented:

Can you add gisel run lines or copies of the test `preload-kernargs.ll`. This is crashing for me with your current changes.

https://github.com/llvm/llvm-project/pull/134655