Make thread_prologue_and_epilogue_insns callable from backends.

	* function.c (thread_prologue_and_epilogue_insns): No longer static.
	* function.h (thread_prologue_and_epilogue_insns): Declare.

From-SVN: r217294

gcc/ChangeLog

@@ -272,6 +272,9 @@
 
 2014-11-06  Bernd Schmidt  <bernds@codesourcery.com>
 
+	* function.c (thread_prologue_and_epilogue_insns): No longer static.
+	* function.h (thread_prologue_and_epilogue_insns): Declare.
+
 	* target.def (assemble_undefined_decl): New hooks.
 	* hooks.c (hook_void_FILEptr_constcharptr_const_tree): New function.
 	* hooks.h (hook_void_FILEptr_constcharptr_const_tree): Declare.

gcc/function.c

@@ -5849,7 +5849,7 @@ emit_return_for_exit (edge exit_fallthru_edge, bool simple_p)
    in a sibcall omit the sibcall_epilogue if the block is not in
    ANTIC.  */
 
-static void
+void
 thread_prologue_and_epilogue_insns (void)
 {
   bool inserted;

gcc/function.h

@@ -902,6 +902,8 @@ extern void stack_protect_epilogue (void);
 extern void expand_function_start (tree);
 extern void expand_dummy_function_end (void);
 
+extern void thread_prologue_and_epilogue_insns (void);
+
 #ifdef RTX_CODE
 extern void diddle_return_value (void (*)(rtx, void*), void*);
 extern void clobber_return_register (void);