[llvm] [AMDGPU] Add an option to completely disable kernel argument preload (PR #153975)

[Tim Gymnich via llvm-commits]

https://github.com/tgymnich approved this pull request.

Would be nice to come up with a name that would reflect this subtle difference. But I cannot find a better name either.

https://github.com/llvm/llvm-project/pull/153975