[clangd] Add "Go to Declaration" functionality
Summary: This change allows to navigate to most identifiers' declarations in code. This is a first step towards implementing "Go to Definition". It reuses clangIndex in order to detect which occurrences corresponds to the position requested. The occurrences' Decls are then used to generate locations suitable for navigating to the declarations.
Reviewers: krasimir, bkramer, ilya-biryukov
Reviewed By: ilya-biryukov
Subscribers: cfe-commits, mgorny
Tags: #clang-tools-extra
Differential Revision: https://reviews.llvm.org/D34269
llvm-svn: 306558
12 files changed