Fix comments and formatrting

From-SVN: r140457

gcc/ChangeLog

 2008-09-18  Andrew MacLeod  <amacleod@redhat.com>
 
+	* tree-outof-ssa.c (eliminate_useless_phis): fix formatting.
+	* tree-flow-.h (struct immediate_use_iterator_d): Fix comment.
+
+2008-09-18  Andrew MacLeod  <amacleod@redhat.com>
+
 	PR tree-optimization/37102
 	* tree-outof-ssa.c (remove_gimple_phi_args): Remove all the PHI args
 	from a node. Check to see if another PHI is dead.

gcc/tree-flow.h

@@ -508,7 +508,7 @@ typedef struct immediate_use_iterator_d
        {
          FOR_EACH_IMM_USE_ON_STMT (use_p, iter)
 	   {
-	     SET_USE (use_p) = blah;
+	     SET_USE (use_p, blah);
 	   }
 	 update_stmt (stmt);
        }							 */

gcc/tree-outof-ssa.c

@@ -606,7 +606,7 @@ replace_def_variable (var_map map, def_operand_p def_p, tree *expr)
 }
 
 
-/* Remove each argument from a PHI node.  If an arg was the last use of an SSA_NAME, 
+/* Remove each argument from PHI.  If an arg was the last use of an SSA_NAME, 
    check to see if this allows another PHI node to be removed.  */
 
 static void
@@ -667,8 +667,8 @@ eliminate_useless_phis (void)
 	    {
 #ifdef ENABLE_CHECKING
 	      size_t i;
-	      /* There should be no arguments of this PHI which are not virtual, or we 
-	         get incorrect results.  */
+	      /* There should be no arguments which are not virtual, or the
+	         results will be incorrect.  */
 	      for (i = 0; i < gimple_phi_num_args (phi); i++)
 	        {
 		  tree arg = PHI_ARG_DEF (phi, i);