[llvm] [AMDGPU] Suppress DataLayout warnings after recent change (PR #163644)

[via llvm-commits]

b-sumner wrote:

> > Generally we just update the four .ll files in the device library. Are there other libraries we're concerned about now where a warning wouldn't be desired?
> 
> It's all the files with a data layout, and if we changed this I suppose there should be auto-upgrade anyway.

Aren't there only 4 files?  Isn't the warning a good thing in general?

https://github.com/llvm/llvm-project/pull/163644