[NFC][AMDGPU] Auto generate check lines for three test cases (#127352)

- `CodeGen/AMDGPU/spill_more_than_wavesize_csr_sgprs.ll`
- `CodeGen/AMDGPU/call-preserved-registers.ll`
- `CodeGen/AMDGPU/stack-realign.ll`

This is to make preparation for another PR.

Author: shiltian