[clang] Introduce new completion context types

Summary: New name suggestions were being used in places where existing names should have been used, this patch tries to fix some of those situations.

Reviewers: sammccall

Reviewed By: sammccall

Subscribers: arphaman, cfe-commits

Differential Revision: https://reviews.llvm.org/D53191

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@345152 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed