Committed: ATTRIBUTE_UNUSED in thread_prologue_and_epilogue_insns

[Joern Rennecke <amylaar at spamcop dot net>]

The pdp11-elf --enable-werror-always build found three more variables
that were unused.

bootstrapped on i686-pc-linux-gnu.

Committed as obvious.
2010-11-04  Joern Rennecke  <amylaar@spamcop.net>

	PR bootstrap/44756
	* function.c (thread_prologue_and_epilogue_insns): Add
	ATTRIBUTE_UNUSED to seq, epilogue_end and entry_edge.

Index: function.c
===================================================================
--- function.c	(revision 166313)
+++ function.c	(working copy)
@@ -5216,8 +5216,8 @@ static void
 thread_prologue_and_epilogue_insns (void)
 {
   bool inserted;
-  rtx seq, epilogue_end;
-  edge entry_edge;
+  rtx seq ATTRIBUTE_UNUSED, epilogue_end ATTRIBUTE_UNUSED;
+  edge entry_edge ATTRIBUTE_UNUSED;
   edge e;
   edge_iterator ei;