[google][4.7]Port function reordering via linker plugin from google/gcc-4_6 branch

gcc/tree-optimize.c

Index: gcc/tree-optimize.c 
=================================================================== 
--- gcc/tree-optimize.c	(revision 187620) 
+++ gcc/tree-optimize.c	(working copy) 
@@ -48,11 +48,17 @@ along with GCC; see the file COPYING3. If not see 
 #include "regset.h"	/* FIXME: For reg_obstack. */ 
 #include "params.h" 
 
+/* Decides if the cgraph callee edges are being cleaned up for the 
+ last time. */ 
+bool cgraph_callee_edges_final_cleanup = false; 
+ 
 /* Gate: execute, or not, all of the non-trivial optimizations. */ 
 
 static bool 
 gate_all_optimizations (void) 
 { 
+ /* The cgraph callee edges can be cleaned up for the last time. */ 
+ cgraph_callee_edges_final_cleanup = true; 
 return (optimize >= 1 
 /* Don't bother doing anything if the program has errors. 
 We have to pass down the queue if we already went into SSA */