Kill lto_bitmap_alloc/free

Index: gcc/lto-streamer.c
===================================================================
--- gcc/lto-streamer.c	(revision 272636)
+++ gcc/lto-streamer.c	(working copy)
@@ -35,11 +35,6 @@  along with GCC; see the file COPYING3.
 /* Statistics gathered during LTO, WPA and LTRANS.  */
 struct lto_stats_d lto_stats;
 
-/* LTO uses bitmaps with different life-times.  So use a separate
-   obstack for all LTO bitmaps.  */
-static bitmap_obstack lto_obstack;
-static bool lto_obstack_initialized;
-
 const char *section_name_prefix = LTO_SECTION_NAME_PREFIX;
 /* Set when streaming LTO for offloading compiler.  */
 bool lto_stream_offload_p;
@@ -113,28 +108,6 @@  lto_tag_name (enum LTO_tags tag)
 }
 
 
-/* Allocate a bitmap from heap.  Initializes the LTO obstack if necessary.  */
-
-bitmap
-lto_bitmap_alloc (void)
-{
-  if (!lto_obstack_initialized)
-    {
-      bitmap_obstack_initialize (&lto_obstack);
-      lto_obstack_initialized = true;
-    }
-  return BITMAP_ALLOC (&lto_obstack);
-}
-
-/* Free bitmap B.  */
-
-void
-lto_bitmap_free (bitmap b)
-{
-  BITMAP_FREE (b);
-}
-
-
 /* Get a section name for a particular type or name.  The NAME field
    is only used if SECTION_TYPE is LTO_section_function_body. For all
    others it is ignored.  The callee of this function is responsible
Index: gcc/lto-streamer.h
===================================================================
--- gcc/lto-streamer.h	(revision 272636)
+++ gcc/lto-streamer.h	(working copy)
@@ -822,8 +822,6 @@  extern void lto_append_block (struct lto
 extern bool lto_stream_offload_p;
 
 extern const char *lto_tag_name (enum LTO_tags);
-extern bitmap lto_bitmap_alloc (void);
-extern void lto_bitmap_free (bitmap);
 extern char *lto_get_section_name (int, const char *, struct lto_file_decl_data *);
 extern void print_lto_report (const char *);
 extern void lto_streamer_init (void);
Index: gcc/lto-streamer-out.c
===================================================================
--- gcc/lto-streamer-out.c	(revision 272636)
+++ gcc/lto-streamer-out.c	(working copy)
@@ -2397,13 +2397,17 @@  lto_output (void)
 {
   struct lto_out_decl_state *decl_state;
   bitmap output = NULL;
+  bitmap_obstack output_obstack;
   int i, n_nodes;
   lto_symtab_encoder_t encoder = lto_get_out_decl_state ()->symtab_node_encoder;
 
   prune_offload_funcs ();
 
   if (flag_checking)
-    output = lto_bitmap_alloc ();
+    {
+      bitmap_obstack_initialize (&output_obstack);
+      output = BITMAP_ALLOC (&output_obstack);
+    }
 
   /* Initialize the streamer.  */
   lto_streamer_init ();
@@ -2419,10 +2423,7 @@  lto_output (void)
 	      && !node->alias)
 	    {
 	      if (flag_checking)
-		{
-		  gcc_assert (!bitmap_bit_p (output, DECL_UID (node->decl)));
-		  bitmap_set_bit (output, DECL_UID (node->decl));
-		}
+		gcc_assert (bitmap_set_bit (output, DECL_UID (node->decl)));
 	      decl_state = lto_new_out_decl_state ();
 	      lto_push_out_decl_state (decl_state);
 	      if (gimple_has_body_p (node->decl)
@@ -2452,10 +2453,7 @@  lto_output (void)
 	    {
 	      timevar_push (TV_IPA_LTO_CTORS_OUT);
 	      if (flag_checking)
-		{
-		  gcc_assert (!bitmap_bit_p (output, DECL_UID (node->decl)));
-		  bitmap_set_bit (output, DECL_UID (node->decl));
-		}
+		gcc_assert (bitmap_set_bit (output, DECL_UID (node->decl)));
 	      decl_state = lto_new_out_decl_state ();
 	      lto_push_out_decl_state (decl_state);
 	      if (DECL_INITIAL (node->decl) != error_mark_node
@@ -2480,9 +2478,11 @@  lto_output (void)
 
   output_offload_tables ();
 
-#if CHECKING_P
-  lto_bitmap_free (output);
-#endif
+  if (flag_checking)
+    {
+      BITMAP_FREE (output);
+      bitmap_obstack_release (&output_obstack);
+    }
 }
 
 /* Write each node in encoded by ENCODER to OB, as well as those reachable