[clangd] Add Value field to HoverInfo

Summary:
Put a symbols value information which is deduced from initializer
expression into HoverInfo struct.

Reviewers: sammccall

Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D63330

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@364390 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed