x86-64: Verify that TLS IE works with APX NF

Verify that

{nf} add %reg1, foo@gottpoff(%rip), %reg2
{nf} add foo@gottpoff(%rip), %reg, %reg2

work correctly with ld and gold.

gas/

	* testsuite/gas/i386/x86-64-gottpoff.d: Updated.
	* testsuite/gas/i386/x86-64-gottpoff.s: Add tests for
	"{nf} add %reg1, foo@gottpoff(%rip), %reg2" and
	"{nf} add foo@gottpoff(%rip), %reg, %reg2".

gold/

	* testsuite/x86_64_ie_to_le.s: Add tests for
	"{nf} add %reg1, foo@gottpoff(%rip), %reg2" and
	"{nf} add foo@gottpoff(%rip), %reg, %reg2".
	* testsuite/x86_64_ie_to_le.sh: Updated.

ld/

	* testsuite/ld-x86-64/tlsbindesc.s: Add R_X86_64_CODE_6_GOTTPOFF
	for APX NF tests.
	* testsuite/ld-x86-64/tlsbindesc.d: Updated.
	* testsuite/ld-x86-64/tlsbindesc.rd: Likewise.

Co-Authored-By: H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>