added new helpers - vfs_stat(), vfs_lstat() and vfs_fstat().
	fs/stat.c switched to use them.

Following patches will

	stat(2) variants in arch/* that used to copy inode fields manually
	switched to vfs_*stat() and partially cleaned up

	irix_...() switched from sys_new*stat() to vfs_*stat() and cleaned
	up.  Missing LFS check added.

	similar for solaris ones

	ditto for x86 compatibility ones on ia64.

We are almost ready to switch to ->getattr() - let filesystem decide what
values should go into ->st_... (e.g. for CODA life would become much
easier if it could just use ->i_size of caching file, for supermount
we want ->i_ino inherited from underlying fs, etc.)

Another thing that needs to be done is fixing the rest of LFS/uid size
fsckups in architecture-specific variants of stat() - I've fixed several,
but quite a few are still there.