Fix wrong-code bug caused by combine_simplify_rtx()

[Eric Botcazou]

> 2005-04-07  Andreas Schwab  <schwab@suse.de>
>
> 	Backport from mainline:
>
> 	2005-04-03  Steven Bosscher  <stevenb@suse.de>
>
> 	PR middle-end/20648
> 	* bb-reorder.c (duplicate_computed_gotos): Do not unfactor
> 	a computed goto if the edge to the computed goto block has
> 	incoming abnormal edges.  Clarify how the function works.
>
> 2005-04-07  Joseph S. Myers  <joseph@codesourcery.com>
>
> 	PR target/20093
> 	* simplify-rtx.c (simplify_unary_operation): Check
> 	SUBREG_PROMOTED_UNSIGNED_P (op) > 0 for zero-extension.

I was wrong, reverting them doesn't change anything.

Trying something else...

-- 
Eric Botcazou