Otherwise memcmp will never get expanded if running the combination of
ThinLTO pre-link and LTO post-link, which is what Rust does, and what
unified LTO does.
The pipeline position is chosen to roughly match what the module
optimization pipeline does. There is no compile-time impact.
For https://github.com/rust-lang/rust/issues/163677.
(cherry picked from commit 17379353858fbac934f573a22e6aa5acce6884d7)
Nikita Popov
94ae4f86b8