Fix for DE40487

[Richard Earnshaw]

This patch allows combine to correctly simplify the instruction sequence
demonstrated by de 40487 (where we are getting redundant zero-extend
operations in logical operations).  tested on an arm-elf cross and
installed on mainline.

R.

2009-07-15  Richard Earnshaw  <rearnsha@arm.com>

        * arm.md (ior_xor): New code iterator.
        (split for ior/xor with shift and zero-extend): New split pattern.
        * arm/predicates.md (subreg_lowpart_operator): New special predicate.


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