[llvm] [AMDGPU][True16][CodeGen] 16bit inline constant check for COPY (PR #150317)

[Brox Chen via llvm-commits]

broxigarchen wrote:

> > It seems we don't have any lit test that generates a COPY with an inline constant.
> 
> If this is also the case downstream, including at the revision where this logic was brought in, it should be removed there.

Oh I mean I am not sure if we need this isCopyMI check. Do we generate COPY with inline constant?

https://github.com/llvm/llvm-project/pull/150317