MS ABI: Bitfields FielDecls only align if they allocate Don't consider a __declspec(align) on a bitfield's declaration if it didn't allocate any underlying storage. This fixes PR19414. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206132 91177308-0d34-0410-b5e6-96231b3b80d8