Add some alignment info where LLVM might otherwise be more pessimistic. In particular, %.nest_arg is always aligned even though it's bitcast from i8*. Pointers in vtables are also guaranteed to be stored at aligned addresses.

#ifndef _GNUC_H
#define _GNUC_H 1

int memicmp(const char *s1, const char *s2, int n);
int stricmp(const char *s1, const char *s2);

#endif