[clang] [AArch64] Fix argument passing for SVE tuples (PR #118961)

[Eli Friedman via cfe-commits]

https://github.com/efriedma-quic approved this pull request.

LGTM

I somehow thought you could use arm_sve_vector_bits with tuples, but I guess not.

https://github.com/llvm/llvm-project/pull/118961