[llvm] [AMDGPU] Select v_lshl_add_u32 instead of v_mul_lo_u32 by constant (PR #71035)

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sstipanovic wrote:

> FYI I landed [f9404a1](https://github.com/llvm/llvm-project/commit/f9404a1b57a5e6050138ceeea327cfd2a4c84f06) to fix the build.

Thanks @nikic. Forgot to regenerate tests one more time. 

https://github.com/llvm/llvm-project/pull/71035