[llvm] [Linker] Propagate `nobuiltin` attributes when linking known libcalls (PR #89431)

[Johannes Doerfert via llvm-commits]

https://github.com/jdoerfert approved this pull request.

The test seems to show my concerns were unwarranted.
See the comment there to make it a little more elaborate.
The code looks good and I don't think it'll impact compile time.


https://github.com/llvm/llvm-project/pull/89431