Merge from mainline.

typedef __builtin_va_list va_list;

typedef unsigned long size_t;

void *memset(void *, int, size_t);

struct S92 { int a:14; } ;

 extern struct S92 s92;

 struct S92 check92 () { struct S92 ret;

 memset (&ret, 0, sizeof (ret));

 ret.a = s92.a;

 return ret; }

struct S93 { __attribute__((aligned (8))) void * a; } ;

 extern struct S93 s93;