auto merge of #10277 : dcrewi/rust/missing-doc-and-visibility-rules, r=alexcrichton

Now the privacy pass returns enough information that other passes do not need to duplicate the visibility rules, and the missing_doc implementation is more consistent with other lint checks.

diff --cc src/librustc/driver/driver.rs
Simple merge

diff --cc src/librustc/middle/lint.rs
Simple merge