mm: Real pagecache iterators

Introduce for_each_pagecache_page() and related macros, with the goal of
replacing most/all uses of pagevec_lookup().

For the most part this shouldn't be a functional change. The one functional
difference with the new macros is that they now take an @end parameter, so we're
able to avoid grabbing pages in __find_get_pages() that we'll never use.

This patch only does some of the conversions, the ones I was able to easily test
myself - the conversions are mechanical but tricky enough they generally warrent
testing.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>

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