llvm-vtabledump: Dump RTTI structures for the MS ABI

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218498 91177308-0d34-0410-b5e6-96231b3b80d8
Fix build breakage on MSVC 2013

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218499 91177308-0d34-0410-b5e6-96231b3b80d8