Fix fill-1 testcase

Fix fill-1 testcase

This fixes various issues with the fill-1 testcase causing fails on a
couple of targets.

gas/ChangeLog:

2017-10-19  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* testsuite/gas/all/fill-1.s: Use normal labels.  Change .text to
	.data. Pick different values.  Use .dc.w instead of .word.
	* testsuite/gas/all/fill-1.d: New objdump output check.
	* testsuite/gas/all/gas.exp: Use run_dump_test to execute fill-1
	testcase.