[llvm] [AMDGPU][True16] si-fold-operand selecting srcidx for v_mov_b16_t16_e64 (PR #162101)

[Brox Chen via llvm-commits]

broxigarchen wrote:

> Missing test changes

This patch is reverting the change in https://github.com/llvm/llvm-project/pull/161764 so I think we don't extra test here?

https://github.com/llvm/llvm-project/pull/162101