[clang] [Clang] Fix C library wrappers for offloading (PR #99716)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> Yeah, rewriting the function signature is gonna be quite a hassle. LG for now.
> 
> If we change the function signature, does it make easier to set default argument?

It'll be similar code, but it would allow us to use the same helpers that the other targets use.

https://github.com/llvm/llvm-project/pull/99716