[clangd] Drop diags from non-written #include.

Summary: This would fix that we show weird diagnostics on random lines of the main file.

Reviewers: ilya-biryukov

Subscribers: MaskRay, jkorous, arphaman, kadircet, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D66074

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@368549 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed