[llvm] [RISCV][GlobalISel] Legalize G_ADD, G_SUB, G_AND, G_OR, G_XOR on RISC-V Vector Extension (PR #71400)

[Michael Maitland via llvm-commits]

michaelmaitland wrote:

> Is the `legalize-vastart-rv32/64.mir` failure caused by my PR or it's not my concern?

Not your concern. You can look to rebase main once it gets fixed on main. 

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