Re: [RFC PATCH v2] iov_iter: Convert iterate*() to inline funcs

        _copy_from_iter                          inc 0x36e -> 0x395 +0x27

Here a disassembly of _copy_from_iter() from unpatched and patched, marked up for
the different iterator-type branches.  To summarise:

		UNPATCHED	PATCHED
		START	LEN	START	LEN
		=======	=======	=======	=======
Prologue	0	77	0	76
UBUF		77	36	76	36
IOVEC		113	148	112	105
BVEC		261	159	217	163
KVEC		420	125	380	116
XARRAY		545	286	496	374
DISCARD/Epi	831	42	870	42
Return		873	-	912	-


The overall change in the entire file, according to size, is:
   19855     744       0   20599    5077 build3/lib/iov_iter.o -- before
   19739     864       0   20603    507b build3/lib/iov_iter.o -- after

David