Auto merge of #78028 - JohnTitor:rollup-jt3hikb, r=JohnTitor

Auto merge of #78028 - JohnTitor:rollup-jt3hikb, r=JohnTitor

Rollup of 10 pull requests

Successful merges:

 - #75209 (Suggest imports of unresolved macros)
 - #77547 (stabilize union with 'ManuallyDrop' fields and 'impl Drop for Union')
 - #77827 (Don't link to nightly primitives on stable channel)
 - #77855 (resolve: further improvements to "try using the enum's variant" diagnostic)
 - #77900 (Use fdatasync for File::sync_data on more OSes)
 - #77925 (Suggest minimal subset features in `incomplete_features` lint)
 - #77971 (Deny broken intra-doc links in linkchecker)
 - #77991 (Bump backtrace-rs)
 - #77992 (instrument-coverage: try our best to not ICE)
 - #78013 (Fix sidebar scroll on mobile devices)

Failed merges:

r? `@ghost`