Update for llvm change.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@203000 91177308-0d34-0410-b5e6-96231b3b80d8
Mention clang-cl in MSVCCompatibility.rst

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@203002 91177308-0d34-0410-b5e6-96231b3b80d8
If a #include finds a file relative to the current file, don't forget to check
whether it's part of a module.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@203005 91177308-0d34-0410-b5e6-96231b3b80d8