[clang] [AMDGPU] Add another SIFoldOperands instance after shrink (PR #67878)

[Stanislav Mekhanoshin via cfe-commits]

rampitec wrote:

> > I've just tested this on 10000 graphics shaders and it seems to make no difference at all. I tried gfx900 and gfx1100. Can anyone else from the graphics team confirm this?
> 
> I can confirm no difference on gfx1102

gfx11 is the same as gfx10, it just bails because of the VOP3 literal support. This is strange for gfx9. Do these shaders use -O2 or -O3?

https://github.com/llvm/llvm-project/pull/67878