$ cat t.cpp
struct __declspec(align(8)) S;
$ ~/llvm/Debug+Asserts/bin/clang -cc1 -triple i686-pc-linux t.cpp -ast-dump
TranslationUnitDecl 0x6d91690 <<invalid sloc>> <invalid sloc>
|-TypedefDecl 0x6d91c00 <<invalid sloc>> <invalid sloc> implicit __builtin_va_list 'char *'
`-CXXRecordDecl 0x6d91c70 <t.cpp:1:1, col:29> col:29 struct S
  `-AlignedAttr 0x6d91d20 <col:19, col:26> align
      `-IntegerLiteral 0x6d91c48 <col:25> 'int' 8