[llvm] [AMDGPU][GlobalISel] Only combine fmin/max into clamp/fmed3 for vgpr-banked dst (PR #211456)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> > Description isn't completely accurate, in globalisel we don't need to lean on uniformity as a proxy for the regbank
> 
> I have updated the description.

Doesn't help after merged (I'm surprised you can change the title after submission)

https://github.com/llvm/llvm-project/pull/211456