[bitmaps] Some more renaming

[Nathan Sidwell]

This patch depends on my 'Early terminating equal_p and intersection_p'
patch.

It renames bitmap_union_of_diff to bitmap_ior_and_compl so that it is
consistent with bitmap_ior_and_compl_into.  I also change the bitmap
operations so that they do not return a 'changed' flag, as (apart from
bitmap_ior_and_compl{,_into}) it is no longer necessary with the intersect_p
operator patch.

This patch has no functional changes.  It'll allow a simpler implementation
of the bitmap operators.

booted & tested on i686-pc-linux-gnu, ok?

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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