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
diff --git a/test/SemaCXX/MicrosoftExtensions.cpp b/test/SemaCXX/MicrosoftExtensions.cpp
index 9b03feb..db6d30a 100644
--- a/test/SemaCXX/MicrosoftExtensions.cpp
+++ b/test/SemaCXX/MicrosoftExtensions.cpp
@@ -81,6 +81,10 @@
     float __stdcall subtractP(); 
 };
 
+// __unaligned handling
+typedef char __unaligned *aligned_type;
+
+
 template<typename T> void h1(T (__stdcall M::* const )()) { }
 
 void m1() {