Fix ICE in insert_to_assembler_name_hash

[Jan Hubicka]

Hi,
this patch fixes ICE in symbol_table::insert_to_assembler_name_hash in cases
where C++ FE produces a symbol but refuses to give it an assembler name (because
it is abstract but w/o abstract flag set).

Bootstrapped/regtested x86_64-linux, comitted.

Index: ChangeLog
===================================================================
--- ChangeLog   (revision 218727)
+++ ChangeLog   (working copy)
@@ -1,5 +1,11 @@
 2014-12-14  Jan Hubicka  <hubi...@ucw.cz>
 
+       PR ipa/61558
+       * symtab.c (symbol_table::insert_to_assembler_name_hash
+       symbol_table::unlink_from_assembler_name_hash): Do not ICE when 
+       DECL_ASSEMBLER_NAME is NULL.
+
+2014-12-14  Jan Hubicka  <hubi...@ucw.cz>
+
        * cgraphunit.c (analyze_functions): Always analyze targets of aliases.
 
 2014-12-14  Jan Hubicka  <hubi...@ucw.cz>
Index: testsuite/g++.dg/torture/pr61558.C
===================================================================
--- testsuite/g++.dg/torture/pr61558.C  (revision 0)
+++ testsuite/g++.dg/torture/pr61558.C  (revision 0)
@@ -0,0 +1,6 @@
+// { dg-do compile }
+static __typeof 0 a __attribute__ ((__weakref__ ("")));
+template <typename> class A
+{
+  static __thread int b;
+};
Index: testsuite/ChangeLog
===================================================================
--- testsuite/ChangeLog (revision 218727)
+++ testsuite/ChangeLog (working copy)
@@ -1,4 +1,9 @@
-2014-12-14  Jan HUbicka  <hubi...@ucw.cz>
+2014-12-14  Jan Hubicka  <hubi...@ucw.cz>      
+       
+       PR ipa/61558
+       * g++.dg/torture/pr61558.C: New testcase.
+
+2014-12-14  Jan Hubicka  <hubi...@ucw.cz>
 
        PR lto/64043
        * g++.dg/lto/pr64043_0.C: New testcase.
Index: symtab.c
===================================================================
--- symtab.c    (revision 218726)
+++ symtab.c    (working copy)
@@ -168,6 +168,11 @@ symbol_table::insert_to_assembler_name_h
 
       tree name = DECL_ASSEMBLER_NAME (node->decl);
 
+      /* C++ FE can produce decls without associated assembler name and insert
+        them to symtab to hold section or TLS information.  */
+      if (!name)
+       return;
+
       hashval_t hash = decl_assembler_name_hash (name);
       aslot = assembler_name_hash->find_slot_with_hash (name, hash, INSERT);
       gcc_assert (*aslot != node);
@@ -209,6 +214,10 @@ symbol_table::unlink_from_assembler_name
        {
          tree name = DECL_ASSEMBLER_NAME (node->decl);
           symtab_node **slot;
+
+         if (!name)
+           return;
+
          hashval_t hash = decl_assembler_name_hash (name);
          slot = assembler_name_hash->find_slot_with_hash (name, hash,
                                                           NO_INSERT);