[ms-abi] Small Change to pack+alignment interaction.

This patch makes a small behavioral change to the interaction between 
pack and alignment.  Specifically it makes __declspec(align()) on a 
field change that field's alignment without respect to pack but the 
alignment change to the record alignment as a whole still obeys pack.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199172 91177308-0d34-0410-b5e6-96231b3b80d8