re PR ipa/58329 (ld: Invalid symbol type for plabel…

re PR ipa/58329 (ld: Invalid symbol type for plabel (.libs/libstdc++.lax/libc++11convenience.a/system_error.o, std::error_category::default_error_condition(int) const [clone .localalias.9]).)


	PR middle-end/58329
	* ipa-devirt.c (ipa_devirt): Be ready for symtab_nonoverwritable_alias
	to return NULL.
	* ipa.c (function_and_variable_visibility): Likewise.
	* ipa-profile.c (ipa_profile): Likewise.

From-SVN: r202658

gcc/symtab.c

@@ -1083,6 +1083,10 @@ symtab_nonoverwritable_alias (symtab_node node)
 		               (void *)&new_node, true);
   if (new_node)
     return new_node;
+#ifndef ASM_OUTPUT_DEF
+  /* If aliases aren't supported by the assembler, fail.  */
+  return NULL;
+#endif
 
   /* Otherwise create a new one.  */
   new_decl = copy_node (node->symbol.decl);