[clang] [llvm] [AArch64] Fix argument passing in reserved registers for preserve_nonecc (PR #96259)

[Eli Friedman via cfe-commits]

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

LGTM.  Please don't forget about the varargs issue, though

https://github.com/llvm/llvm-project/pull/96259