[llvm] Reland "[llvm][AArch64] Copy all operands when expanding BLR_BTI bundle (#78267)" (PR #78719)

[Eli Friedman via llvm-commits]

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

Sure, we can just do this for now.  LGTM

https://github.com/llvm/llvm-project/pull/78719