Fix regression from change

Fix regression from change
http://sourceware.org/ml/binutils-cvs/2012-01/msg00049.html .  The
code needs to check that the symbol is not a local symbol before
accessing a non-local-symbol field.

	* tc-tilepro.c (emit_tilepro_instruction): Check if symbol is
	non-local before checking sy_value.
	* tc-tilegx.c (emit_tilegx_instruction): Ditto.