[llvm] [AMDGPU] Define constrained multi-dword scalar load instructions. (PR #96161)

[Stanislav Mekhanoshin via llvm-commits]

rampitec wrote:

> > I also must say that s_buffer_load is in the same bucket.
> 
> Buffer loads are generated for the buffer intrinsic and we take care of them during legalization to always use natural alignment. But we might require the *_ec buffer opcodes for SILoadStoreOptimizer while merging them. @rampitec do you think that can happen?

It can happen I believe.

https://github.com/llvm/llvm-project/pull/96161