linker-messages is warn-by-default again
Merged
JY
5mo ago+129+129+012345678901234567890123456789-18-18-01234567890123456789
I ended up keeping it a lint and adding an option for lints to ignore -Dwarnings (there was already a lint that did that actually, it was just hard-coded in rustc_middle instead of in rustc_lint_defs like I'd expect). This allows people to actually see the warnings without them failing the build in CI.