[ARC] Cleanup TLS implementation and add a number of tests.

gcc/
xxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.c (arc_get_tp): Remove function.
	(arc_emit_call_tls_get_addr): Likewise.
	(arc_call_tls_get_addr): New function.
	(arc_legitimize_tls_address): Make use of arc_call_tls_get_addr.
	* config/arc/arc.md (tls_load_tp_soft): Remove.
	(tls_gd_get_addr): Likewise.

testsuite/
xxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>

	* gcc.target/arc/tls-gd.c: New file.
	* gcc.target/arc/tls-ie.c: Likewise.
	* gcc.target/arc/tls-ld.c: Likewise.
	* gcc.target/arc/tls-le.c: Likewise.
	* gcc.target/arc/tls-1.c: Update test.

From-SVN: r265674