[llvm] [PowerPC] Replace vspltisw+vadduwm instructions with xxleqv+vsubuwm for adding the vector {1, 1, 1, 1} (PR #160882)

[Lei Huang via llvm-commits]

lei137 wrote:

I'm guessing this is not ready to be reviewed as it need https://github.com/llvm/llvm-project/pull/160476/files to be in first enable to show the difference.


https://github.com/llvm/llvm-project/pull/160882