[MSVC] Support for __unaligned qualifier in functions

This implements support for MS-specific __unaligned qualifier in functions and
makes the following test case both compile and mangle correctly:

struct S {
    void f() __unaligned;
};
void S::f() __unaligned {
}

Differential Revision: http://reviews.llvm.org/D20437

llvm-svn: 270834
diff --git a/clang/lib/AST/DeclCXX.cpp b/clang/lib/AST/DeclCXX.cpp
index 45205e8..2a1fac8 100644
--- a/clang/lib/AST/DeclCXX.cpp
+++ b/clang/lib/AST/DeclCXX.cpp
@@ -1646,7 +1646,7 @@
 
   QualType ClassTy = C.getTypeDeclType(getParent());
   ClassTy = C.getQualifiedType(ClassTy,
-                               Qualifiers::fromCVRMask(getTypeQualifiers()));
+                               Qualifiers::fromCVRUMask(getTypeQualifiers()));
   return C.getPointerType(ClassTy);
 }