RAV reunification: merge r190728

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209244 91177308-0d34-0410-b5e6-96231b3b80d8
RAV reunification: merge DISPATCH_STMT() macro back to standard RAV

Also add the missing undef in both files.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209245 91177308-0d34-0410-b5e6-96231b3b80d8
RAV reunification: merge Lambda body visitation to DRAV

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209246 91177308-0d34-0410-b5e6-96231b3b80d8
Reduce string duplication

If we're so keen on saving a dynamic allocation to add the trailing space, we
might as well do it in style.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209247 91177308-0d34-0410-b5e6-96231b3b80d8