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

[Joe Nash via cfe-commits]

Sisyph 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

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