Introduce a testbed for merging multiple ASTs into a single AST
context with the AST importer. WIP, still useless but at least it has
a test.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@95683 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed