[MS-ABI] Fixed __declspec(align()) on bitfields under #pragma pack.

[MS-ABI] Fixed __declspec(align()) on bitfields under #pragma pack.
When __declspec(align()) is applied to a bitfield it affects the
alignment rather than the required alignment of the struct.  The major
feature that this patch adds is that the alignment of the structure
obeys the alignment of __declspec(align()) from the bitfield over the
value specified in pragma pack.

Test cases are included.
The patch also includes some small cleanups in recordlayoutbuilder and
some cleanups to some lit tests, including line endings (but no
functionality change to lit tests)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@205994 91177308-0d34-0410-b5e6-96231b3b80d8