Add support for MSVC __unaligned attribute. Necessary to parse MSVC headers in 64-bit mode (ie: when _M_IA64 or _M_AMD64 is defined)

more info: http://msdn.microsoft.com/en-us/library/ms177389.aspx

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137935 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed