[llvm] [AArch64] Fix the size passed to __trampoline_setup (PR #118234)

[via llvm-commits]

ssijaric-nv wrote:

Thanks, David.  I have only seen cases where we go through the FrameIndex path as the trampoline is on the stack.  I can add a test where the trampoline is a global belonging to a section that can be executed, which will trigger the 'else' check. Or perhaps turn the 'else' into an assert?

https://github.com/llvm/llvm-project/pull/118234