Do not remove ifunc_resolver in LTO.

	PR lto/94659
	* cgraph.h (cgraph_node::can_remove_if_no_direct_calls_and_refs_p):
	Do not remove ifunc_resolvers in remove unreachable nodes in LTO.

gcc/ChangeLog

+2020-04-27  Martin Liska  <mliska@suse.cz>
+
+	PR lto/94659
+	* cgraph.h (cgraph_node::can_remove_if_no_direct_calls_and_refs_p):
+	Do not remove ifunc_resolvers in remove unreachable nodes in LTO.
+
 2020-04-27  Xiong Hu Luo  <luoxhu@linux.ibm.com>
 
 	PR target/91518

gcc/cgraph.h

@@ -3162,7 +3162,7 @@ cgraph_node::can_remove_if_no_direct_calls_and_refs_p (void)
     return false;
   /* Only COMDAT functions can be removed if externally visible.  */
   if (externally_visible
-      && (!DECL_COMDAT (decl)
+      && ((!DECL_COMDAT (decl) || ifunc_resolver)
 	  || forced_by_abi
 	  || used_from_object_file_p ()))
     return false;