Make use of the Index library through the index-test tool.

'index-test' is now able to provide additional info for a Decl, through multiple AST files:
-Find declarations
-Find definitions
-Find references

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@74803 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed