Implement code completion support for module import declarations, e.g.,

  @import <complete with module names here>

or

  @import std.<complete with submodule names here>

Addresses <rdar://problem/10710117>.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149199 91177308-0d34-0410-b5e6-96231b3b80d8
15 files changed