[libclang] Indexing API:

[libclang] Indexing API:

-For indexDeclaration, also pass the declaration attributes as an array of cursors.
-Rename CXIndexOpt_OneRefPerFile -> CXIndexOpt_SuppressRedundantRefs, and only pass
  a reference if a declaration/definition does not exist in the file.
-Other fixes.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@144942 91177308-0d34-0410-b5e6-96231b3b80d8