Pass --no-relax to ld in ld-x86-64/pr18591.d

Pass --no-relax to ld so that GOTPCREL relocation will be kept.

	* testsuite/ld-x86-64/pr18591.d: Pass --no-relax to ld.

ld/ChangeLog

+2016-05-05  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* testsuite/ld-x86-64/pr18591.d: Pass --no-relax to ld.
+
 2016-05-04  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* ldlang.c (init_os): Pass %E to einfo when bfd_section == NULL.

ld/testsuite/ld-x86-64/pr18591.d

 #as: --64
-#ld: -melf_x86_64 -shared -z max-page-size=0x200000
+#ld: -melf_x86_64 -shared -z max-page-size=0x200000 --no-relax
 #objdump: -dw
 
 .*: +file format .*