reload1.c (move2add_note_store): Treat all registers about which no information is known as potential bases...

* reload1.c (move2add_note_store): Treat all registers about which
no information is known as potential bases, and treat all
registers directly or indirectly derived from it as members of the
same set of values.
(reload_cse_move2add): Adjust accordingly.  Take mode and
offset of base register into account.

From-SVN: r39135