[llvm] [RISCV][GlobalISel] Legalize scalable vectorized G_ADD, G_SUB, G_AND, G_OR, and G_XOR (PR #71400)

[Jiahan Xie via llvm-commits]

jiahanxie353 wrote:

Is there anything I need to do to make this patch merge into main?
After that I can pick that merged commit from my instruction selection patch and have that patch fully tested as well.

https://github.com/llvm/llvm-project/pull/71400