Comment changes.  Added current problems comment.

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@187942 91177308-0d34-0410-b5e6-96231b3b80d8
Expanded modularize tests.

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@187943 91177308-0d34-0410-b5e6-96231b3b80d8