Fix 16846, LTO mismatched TLS reference

[Alan Modra]

I think this is all we need to fix pr16848.  HJ, do you see anything
more we should do here?  I'm wondering why we have type_change_ok
when oldbfd is the plugin.

	PR 16848
	* elflink.c (_bfd_elf_merge_symbol): Ignore TLS mismatch when
	current bfd is a plugin.

diff --git a/bfd/elflink.c b/bfd/elflink.c
index 3de00e1..9848dc2 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -1108,6 +1108,8 @@ _bfd_elf_merge_symbol (bfd *abfd,
   /* Plugin symbol type isn't currently set.  Stop bogus errors.  */
   if (oldbfd != NULL && (oldbfd->flags & BFD_PLUGIN) != 0)
     *type_change_ok = TRUE;
+  else if ((abfd->flags & BFD_PLUGIN) != 0)
+    ;
 
   /* Check TLS symbol.  We don't check undefined symbol introduced by
      "ld -u".  */

-- 
Alan Modra
Australia Development Lab, IBM