[libclang] Further simplify the indexing API.

That stuff can be added later on if we need them.
Also add some const goodness.

llvm-svn: 144446
8 files changed
tree: 6b3a9248486bcc0b731993a052bbe3a1521118dc
  1. clang/
  2. compiler-rt/
  3. debuginfo-tests/
  4. libcxx/
  5. libcxxabi/
  6. lldb/
  7. llvm/
  8. polly/