tree 1756abde87154fc918dbe4d6839c0ffdbf206a62
parent 98c9d1fa3776204a94c013f1dc25f62d75c00573
author Douglas Gregor <dgregor@apple.com> 1283370742 +0000
committer Douglas Gregor <dgregor@apple.com> 1283370742 +0000

Implement libclang support for using declarations. Clang actually uses
three different kinds of AST nodes to represent using declarations:
UsingDecl, UnresolvedUsingValueDecl, and
UnresolvedUsingTypenameDecl. These three are collapsed into a single
cursor kind for using declarations, since libclang clients don't need
the distinction.

Several related changes here:
  - Cursor visitation of the three AST nodes for using declarations
  - Proper source-range computation for these AST nodes
  - Using declarations have no USRs, since they don't actually declare
    any entities.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@112730 91177308-0d34-0410-b5e6-96231b3b80d8