irio: remove set_op_pinned function

You should specify the pinned attribute when calling new_ir_op and not
change it later.

include/libfirm/irop.h

@@ -85,10 +85,6 @@ FIRM_API const char *get_op_pin_state_name(op_pin_state s);
 /** Returns pinned state of an opcode. */
 FIRM_API op_pin_state get_op_pinned(const ir_op *op);
 
-/** Sets pinned in the opcode.  Setting it to floating has no effect
-    for Block, Phi and control flow nodes. */
-FIRM_API void set_op_pinned(ir_op *op, op_pin_state pinned);
-
 /** Returns the next free IR opcode number, allows to register user ops. */
 FIRM_API unsigned get_next_ir_opcode(void);
 

ir/ir/irop.c

@@ -153,12 +153,6 @@ op_pin_state (get_op_pinned)(const ir_op *op)
 	return get_op_pinned_(op);
 }
 
-void set_op_pinned(ir_op *op, op_pin_state pinned)
-{
-	if (op == op_Block || op == op_Phi || is_op_cfopcode(op)) return;
-	op->pin_state = pinned;
-}
-
 unsigned get_next_ir_opcode(void)
 {
 	return next_iro++;