[patch] ree.c: don't abuse GTY

[Steven Bosscher]

Hello,

ree.c's data structures are not GC-allocated, so its GTY markers and
its TODO_ggc_collect are unnecessary.

Will commit as obvious after the usual testing on my favourite platforms :-)

        * ree.c (struct ext_cand): Remove GTY markers.
        (pass_ree): Remove TODO_ggc_collect.

Index: ree.c
===================================================================
--- ree.c       (revision 194247)
+++ ree.c       (working copy)
@@ -243,7 +243,7 @@

 /* This structure represents a candidate for elimination.  */

-typedef struct GTY(()) ext_cand
+typedef struct ext_cand
 {
   /* The expression.  */
   const_rtx expr;
@@ -958,7 +958,6 @@
   0,                                    /* properties_provided */
   0,                                    /* properties_destroyed */
   0,                                    /* todo_flags_start */
-  TODO_ggc_collect |
   TODO_verify_rtl_sharing,              /* todo_flags_finish */
  }
 };