[llvm] [AMDGPU] Prevent cyclic behaviour in SIFoldOperands (PR #82099)

[via llvm-commits]

choikwa wrote:

An example would be

  UseMI: %49:vgpr_32 = V_MUL_HI_U32_e64 %5:vgpr_32, %35.sub0:sreg_64, implicit $exec

and 

  RSUseMI: %77:vgpr_32 = V_MUL_HI_U32_e64 %75:vgpr_32, %35.sub0:sreg_64, implicit $exec

https://github.com/llvm/llvm-project/pull/82099