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[clangd] Implement Relations request for remote index

Authored by kbobyrev on Jul 30 2020, 3:57 AM.

Description

[clangd] Implement Relations request for remote index

This is the last missing bit in the core remote index implementation. The only
remaining bits are some API refactorings (replacing Optional with Expected and
being better at reporting errors).

Reviewed By: kadircet

Differential Revision: https://reviews.llvm.org/D84894

Details