Its purpose is to provide the basic infrastructure for cross-translation-unit analysis like indexing, refactoring, etc.

Currently it is very "primitive" and with no type-names support. It can provide functionality like
"show me all references of this function from these translation units".

llvm-svn: 74802

llvm-svn: 67633

llvm-svn: 65847

must be under the `tools' subdirectory of the LLVM *source* tree.

llvm-svn: 58180