[patch] Fix PR middle-end/18029 and PR middle-end/18030 (4.1 material)

[Roger Sayle]

Hi Kazu,

On Sat, 16 Oct 2004, Kazu Hirata wrote:
> 2004-10-16  Kazu Hirata  <kazu@cs.umass.edu>
>
> 	PR middle-end/18029 and PR middle-end/18030
> 	* expr.c (expand_assignment): Add a special case to handle
> 	BIT_IOR_EXPR and BIT_XOR_EXPR.

This patch is OK for 4.1 (though I gave serious thought to approving
it for mainline).

I also agree that we should factor either expand_component_assignment
or expand_bitfield_assignment out of expand_assignment, and that this
will be easier after your proposed clean-up to avoid expand_assignment
returning a rtx.  Depending upon how invasive/safe these clean-ups are,
they may also need to wait until 4.1.

Roger
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