[MS-ABI] adds padding before all vbases after a bitfield
 
MS-ABI adds padding before *every* vbase if the last field in a record 
is a bit-field. This changes clangs behavior to match. I also fix some 
windows-style line endings in the test file.

Differential Revision: http://llvm-reviews.chandlerc.com/D2277



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@196605 91177308-0d34-0410-b5e6-96231b3b80d8