[ARC] Remove unused patterns, refactor unspec+offset pattern gen.

[ARC] Remove unused patterns, refactor unspec+offset pattern gen.

2016-12-05  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc-protos.h (insn_is_tls_gd_dispatch): Remove.
	* config/arc/arc.c (arc_unspec_offset): New function.
	(arc_finalize_pic): Change.
	(arc_emit_call_tls_get_addr): Likewise.
	(arc_legitimize_tls_address): Likewise.
	(arc_legitimize_pic_address): Likewise.
	(insn_is_tls_gd_dispatch): Remove.
	* config/arc/arc.h (INSN_REFERENCES_ARE_DELAYED): Change.
	* config/arc/arc.md (ls_gd_load): Remove unused pattern.
	(tls_gd_dispatch): Likewise.

From-SVN: r243244