use environment also in non-debug mode.

[r25823]

ir/opt/opt_ldst.c

@@ -132,13 +132,13 @@ typedef struct ldst_env_t {
 #endif
 } ldst_env;
 
+/* the one and only environment */
+static ldst_env env;
+
 #ifdef DEBUG_libfirm
 
 static firm_dbg_module_t *dbg;
 
-/* the one and only environment */
-static ldst_env env;
-
 /**
  * Dumps the block list.
  *