Make a stub version of MITests, instead of reverting.

Lit tends to find out-of-date unittests in the build tree.

FIXME: It may be reverted several days after.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261194 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed