Remove dead handling of label_decl in tree merging

Remove dead handling of label_decl in tree merging

[Jan Hubicka]

Hi,
while working on incremental WHOPR with Michal Jires, we noticed that
there is code hashing LABEL_DECL_UID in lto-streamer-out which would
break the hash table, since label decls are not streamed and gets
re-initialized later.

The whole conditional is dead since LABEL_DECLs are not merged across
TUs.

ltobootstrapped/regtested x86_64-linux, plan to commit it shortly.

gcc/ChangeLog:

	* lto-streamer-out.cc (hash_tree): Remove dead handling of LABEL_DECL.

gcc/lto/ChangeLog:

	* lto-common.cc (compare_tree_sccs_1): Remove dead handling of LABEL_DECL.

diff --git a/gcc/lto-streamer-out.cc b/gcc/lto-streamer-out.cc
index 0bca530313c..27f9edd3fcd 100644
--- a/gcc/lto-streamer-out.cc
+++ b/gcc/lto-streamer-out.cc
@@ -1268,12 +1268,8 @@ hash_tree (struct streamer_tree_cache_d *cache, hash_map<tree, hashval_t> *map,
       hstate.add_flag (DECL_NOT_GIMPLE_REG_P (t));
       hstate.commit_flag ();
       hstate.add_int (DECL_ALIGN (t));
-      if (code == LABEL_DECL)
-	{
-          hstate.add_int (EH_LANDING_PAD_NR (t));
-	  hstate.add_int (LABEL_DECL_UID (t));
-	}
-      else if (code == FIELD_DECL)
+      gcc_checking_assert (code != LABEL_DECL);
+      if (code == FIELD_DECL)
 	{
 	  hstate.add_flag (DECL_PACKED (t));
 	  hstate.add_flag (DECL_NONADDRESSABLE_P (t));
diff --git a/gcc/lto/lto-common.cc b/gcc/lto/lto-common.cc
index 882dd8971a4..597fc5dbabf 100644
--- a/gcc/lto/lto-common.cc
+++ b/gcc/lto/lto-common.cc
@@ -1180,12 +1180,8 @@ compare_tree_sccs_1 (tree t1, tree t2, tree **map)
       compare_values (DECL_EXTERNAL);
       compare_values (DECL_NOT_GIMPLE_REG_P);
       compare_values (DECL_ALIGN);
-      if (code == LABEL_DECL)
-	{
-	  compare_values (EH_LANDING_PAD_NR);
-	  compare_values (LABEL_DECL_UID);
-	}
-      else if (code == FIELD_DECL)
+      gcc_checking_assert (code != LABEL_DECL);
+      if (code == FIELD_DECL)
 	{
 	  compare_values (DECL_PACKED);
 	  compare_values (DECL_NONADDRESSABLE_P);