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

[David Spickett via llvm-commits]

DavidSpickett wrote:

Windows failure is `Driver/linker-wrapper.c` which is unrelated (fixed since this PR was posted I think), so going ahead with landing this.

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