[llvm] [RISCV][GlobalISel] Vector Extension vadd Legalizer (PR #71400)

[Michael Maitland via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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michaelmaitland wrote:

[This](https://github.com/llvm/llvm-project/blob/e836283d43ef598180acb3e61d0c6259606ec85a/llvm/test/CodeGen/RISCV/GlobalISel/irtranslator/vec-args.ll) file should give you a good idea which types we'd like to legalize.

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