* elf64-x86-64.c (elf_x86_64_check_tls_transition): Allow

	64-bit -mcmodel=large -fpic TLS GD and LD sequences.
	(elf_x86_64_relocate_section): Handle -mcmodel=large -fpic
	TLS GD and LD sequences in GD->LE, GD->IE and LD->LE transitions.
ld/testsuite/
	* ld-x86-64/x86-64.exp: Add tlsld3, tlsgd7 and tlsgd8 tests.
	* ld-x86-64/tlspic1.s: Add -mcmodel=large -fpic TLS GD and LD
	sequences.
	* ld-x86-64/tlspic.dd: Adjusted.
	* ld-x86-64/tlspic.rd: Adjusted.
	* ld-x86-64/tlspic-nacl.rd: Adjusted.
	* ld-x86-64/tlsld3.dd: New test.
	* ld-x86-64/tlsld3.s: New file.
	* ld-x86-64/tlsgd7.dd: New test.
	* ld-x86-64/tlsgd7.s: New file.
	* ld-x86-64/tlsgd8.dd: New test.
	* ld-x86-64/tlsgd8.s: New file.