[llvm] [AMDGPU] Add missing GFX10 buffer format d16 hi instructions (PR #84809)

[Stanislav Mekhanoshin via llvm-commits]

rampitec wrote:

> > Why were these initially disabled?
> 
> I don't know. I wasn't involved. @rampitec do you remember?

I do not remember now either.

https://github.com/llvm/llvm-project/pull/84809