shrink-wrap: Fix up partitions (PR67587)

With the new shrink-wrap algorithm, blocks reachable both with and
without prologue are duplicated, and their incoming edges are then
distributed accordingly.  So we need to call fixup_partitions.


2015-09-16  Segher Boessenkool  <segher@kernel.crashing.org>

	PR bootstrap/67587
	* function.c (rest_of_handle_thread_prologue_and_epilogue): Call
	fixup_partitions.

From-SVN: r227827

gcc/ChangeLog

+2015-09-16  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR bootstrap/67587
+	* function.c (rest_of_handle_thread_prologue_and_epilogue): Call
+	fixup_partitions.
+
 2015-09-16  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/67253

gcc/function.c

@@ -6668,6 +6668,10 @@ rest_of_handle_thread_prologue_and_epilogue (void)
      scheduling to operate in the epilogue.  */
   thread_prologue_and_epilogue_insns ();
 
+  /* Some non-cold blocks may now be only reachable from cold blocks.
+     Fix that up.  */
+  fixup_partitions ();
+
   /* Shrink-wrapping can result in unreachable edges in the epilogue,
      see PR57320.  */
   cleanup_cfg (0);