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

[David Spickett via llvm-commits]

DavidSpickett wrote:

Turns out `expandCALL_RVMARKER` is doing the right thing, just took me a while to understand it. So the code is almost the same now. I could factor it out but keeping the PR small for now.

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