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[clangd] Highlighting auto variables as the deduced type.

Authored by jvikstrom on Aug 12 2019, 12:45 AM.

Description

[clangd] Highlighting auto variables as the deduced type.

Summary:
Done in VisitDeclaratorDecl as the AutoTypeLoc is not deduced.
Scoped to only work for variables.
auto function return values need to be handled in a special way (separate patch for that).
auto's that are in lambdas ar enot highlighted as we don't highlight their underlying type (it's a RecordDecl, but the name is not an identifier so it returns in addToken).

Reviewers: hokein, ilya-biryukov

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

Tags: #clang

Differential Revision: https://reviews.llvm.org/D65996

llvm-svn: 368546