[compiler-rt] [compiler-rt] Add CMake option to enable execute-only code generation on AArch64 (PR #140555)

[Saleem Abdulrasool via llvm-commits]

https://github.com/compnerd commented:

I don't think that this properly handles MachO. Additionally, I don't understand the need for the `unique` flag on the section, nor the section id (`0`).

https://github.com/llvm/llvm-project/pull/140555