[llvm] [AArch64][CodeGen] Fix trampoline basic block offset (PR #202716)

[via llvm-commits]

eleviant wrote:

@dhoekwater Addressed the comments. My understanding is that `updateOffsetAndLiveness` only recalculates offsets for newly created trampoline block, so it should be safe to move it into `createNewBlockAfter`.

https://github.com/llvm/llvm-project/pull/202716