[llvm] [RISCV][GlobalISel] Fix legalizing ‘llvm.va_copy’ intrinsic (PR #86863)

[via llvm-commits]

bvlgah wrote:

> Lgtm

Thanks. I have only compiled and test the example to reproduce the problem, and it works fine now.

https://github.com/llvm/llvm-project/pull/86863