ir: Provide an inline implementation of get_irn_in().

ir/ir/irnode.c

@@ -143,11 +143,6 @@ int (get_irn_arity)(const ir_node *node)
 	return get_irn_arity_(node);
 }
 
-ir_node **get_irn_in(const ir_node *node)
-{
-	return node->in;
-}
-
 void set_irn_in(ir_node *const node, int const arity, ir_node *const *const in)
 {
 	assert(node != NULL && node->kind == k_ir_node);

ir/ir/irnode_t.h

@@ -86,7 +86,10 @@
  * Note that this function returns the whole in array including the
  * block predecessor. So, it is NOT symmetric with set_irn_in().
  */
-ir_node **get_irn_in(const ir_node *node);
+static inline ir_node **get_irn_in(ir_node const *const node)
+{
+	return node->in;
+}
 
 /*-------------------------------------------------------------------*/
 /*  These function are most used in libfirm.  Give them as static    */