[clang] [Inliner] Improve propagation of return attributes. (PR #67756)

[via cfe-commits]

goldsteinn wrote:

> It looks like x86-bswap.c still has the C++ guarded code in it.
> 
> Any thoughts on
> 
> > Though I think we might be better off passing `-no-enable-noundef-analysis` to these tests, as noundef is really not what they want to test.
> 
> to avoid the test duplication?

That seems like a better approach. Doing so.

https://github.com/llvm/llvm-project/pull/67756