Transparent alias suport part 3 (lto-symtab fixes)

Transparent alias suport part 3 (lto-symtab fixes)

[Jan Hubicka]

Hi,
this patch fixes and ICE in symtab_node::verify_base when there is a missing
entry in the symol table - bug I noticed while debugging the patch.
Second fix makes symtab_node::noninterposable_alias to skip all transaprent
aliases because these can not change visibility. (this is needed because the
way we represent weakrefs as a static variable while it really inherits visibility
of its target that may be unknown)

Bootstrapped/regtested x86_64-linux, will commit it shortly.

	* symtab.c (symtab_node::verify_base): Fix thinko in a conditional.
	(symtab_node::noninterposable_alias): Do not accept transparent
	aliases.
Index: symtab.c
===================================================================
--- symtab.c	(revision 231425)
+++ symtab.c	(working copy)
@@ -1005,7 +1005,7 @@ symtab_node::verify_base (void)
 	}
       if (!hashed_node
 	  && !(is_a <varpool_node *> (this)
-	       || DECL_HARD_REGISTER (decl)))
+	       && DECL_HARD_REGISTER (decl)))
 	{
           error ("node not found in symtab assembler name hash");
           error_found = true;
@@ -1637,7 +1637,7 @@ symtab_node::resolve_alias (symtab_node
 bool
 symtab_node::noninterposable_alias (symtab_node *node, void *data)
 {
-  if (decl_binds_to_current_def_p (node->decl))
+  if (!node->transparent_alias && decl_binds_to_current_def_p (node->decl))
     {
       symtab_node *fn = node->ultimate_alias_target ();