A small patch to fix an arm bootstrap failure

[Vladimir Makarov]

The following patch is to fix an arm bootstrap failure described in

http://gcc.gnu.org/ml/gcc/2011-03/msg00499.html

when variable mode is set but not used because it is used when macro 
HONOR_REG_ALLOC_ORDER is defined.

I found that 2 variables mode in different scopes is defined in function 
assign_hard_reg.  Using only one variable will guarantee usage of the 
variable.

The patch has been committed as obvious after successful bootstrap on 
x86_64.


2011-03-30  Vladimir Makarov <vmakarov@redhat.com>

         * ira-color.c (ira_assign_hard_reg): Use only one variable 'mode'.

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