[llvm] [LibCall] Infer nocallback for libcalls (PR #135173)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

Generally, I'd be a lot more comfortable if this were limited to the "obvious" stuff (like memcmp not going to call back to user code) and skip everything syscall related.

https://github.com/llvm/llvm-project/pull/135173