[clangd] IncludeCleaner: Mark possible expr resolutions as used

Fixes: https://github.com/clangd/clangd/issues/934

Reviewed By: sammccall

Differential Revision: https://reviews.llvm.org/D114287

GitOrigin-RevId: b5f20372a82f72f03d47181b87fb55f62772324f
2 files changed