[compiler-rt] [llvm] [AArch64] Implement INIT/ADJUST_TRAMPOLINE (PR #70267)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> Updates #27174

Can you change the description? It will be used as the default commit message when you click "Squash and merge".
git commit messages are completely ignored.

https://github.com/llvm/llvm-project/pull/70267