[clang] [llvm] [WIP][OpenMP] Remove dependency on `libffi` from offloading runtime (PR #91264)

[Alexey Bataev via cfe-commits]

alexey-bataev wrote:

> ```llvm
> = load i32, ptr %.capture_expr., align 4
> ```

Why do you think it reads beyond __context? %2 = getelementptr inbounds %struct.anon, ptr %1, i32 0, i32 0 points to the first element in the __context, if I'm not missing something. If it has the wrong value, looks like it is not written correctly

https://github.com/llvm/llvm-project/pull/91264