Added function firm_be_finish.

[r20855]

ir/be/be_t.h

@@ -110,6 +110,7 @@ unsigned be_put_ignore_regs(const be_irg_t *birg,
  * Initialize the backend. Must be run first in init_firm();
  */
 void firm_be_init(void);
+void firm_be_finish(void);
 
 extern int be_timing;
 

ir/be/bemain.c

@@ -368,6 +368,12 @@ void firm_be_init(void)
 	be_init_modules();
 }
 
+/* Finalize the Firm backend. */
+void firm_be_finish(void)
+{
+	be_quit_modules();
+}
+
 /* Returns the backend parameter */
 const backend_params *be_get_backend_param(void)
 {