Generate input files from within unit test

It is preferable for a unit test to be responsible for creating its own input
data instead of relying on checked-in data files. Now the IncludeExcludeTest
for cpp11-migrate does this.

- Removed old data files.
- Updated build system and lit files to remove references to old data files.



git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@181029 91177308-0d34-0410-b5e6-96231b3b80d8