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

[David Green via llvm-commits]

https://github.com/davemgreen approved this pull request.

This looks like it matches https://github.com/llvm/llvm-project/blob/main/compiler-rt/lib/builtins/trampoline_setup.c.

Is it worth adding a test for the FrameIndex size and static versions?

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