[Patch]: Guard the call to begin_epilogue

[Tristan Gingold]

Hi,

currently, the call to begin_epilogue debug hook in final_scan_insn is 
unconditional and therefore occurs even when DECL_IGNORED_P is true.  This is 
not what is done for other debug hooks, and leads to ICE on VMS (the only 
platform that defines the hook) as last_filename is NULL.

Tested on alpha64-dec-openvms,
committed to trunk as obvious.

Tristan.

2011-12-13  Tristan Gingold  <ging...@adacore.com>

        * final.c (final_scan_insn): Guard the call to begin_epilogue
        debug hook.

Index: final.c
===================================================================
--- final.c     (revision 182280)
+++ final.c     (working copy)
@@ -1973,7 +1973,8 @@
          break;
 
        case NOTE_INSN_EPILOGUE_BEG:
-         (*debug_hooks->begin_epilogue) (last_linenum, last_filename);
+          if (!DECL_IGNORED_P (current_function_decl))
+            (*debug_hooks->begin_epilogue) (last_linenum, last_filename);
          targetm.asm_out.function_begin_epilogue (file);
          break;