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 <vmaka...@redhat.com>

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

Index: ira-color.c
===================================================================
--- ira-color.c (revision 171713)
+++ ira-color.c (working copy)
@@ -1622,10 +1622,11 @@ assign_hard_reg (ira_allocno_t a, bool r
              if (hard_regno >= 0
                  && ira_class_hard_reg_index[aclass][hard_regno] >= 0)
                {
-                 enum machine_mode mode = ALLOCNO_MODE (conflict_a);
-                 int conflict_nregs = hard_regno_nregs[hard_regno][mode];
                  int n_objects = ALLOCNO_NUM_OBJECTS (conflict_a);
+                 int conflict_nregs;
 
+                 mode = ALLOCNO_MODE (conflict_a);
+                 conflict_nregs = hard_regno_nregs[hard_regno][mode];
                  if (conflict_nregs == n_objects && conflict_nregs > 1)
                    {
                      int num = OBJECT_SUBWORD (conflict_obj);