[NDS32] Rewrite PIC/TLS patterns.

[NDS32] Rewrite PIC/TLS patterns.

gcc/
	* config/nds32/nds32-md-auxiliary.c
	(nds32_legitimize_pic_address): Use new PIC pattern.
	(nds32_legitimize_tls_address): Use new TLS pattern.
	(nds32_output_symrel): New.
	* config/nds32/nds32-protos.h (nds32_output_symrel): Declare.
	(nds32_alloc_relax_group_id): Ditto.
	* config/nds32/nds32-relax-opt.c (nds32_alloc_relax_group_id): New.
	(nds32_group_insns): Use nds32_alloc_relax_group_id instead of use
	relax_group_id.
	(nds32_group_tls_insn): Ditto.
	(nds32_group_float_insns): Ditto.
	* config/nds32/nds32.md (tls_le): New.
	(sym_got): Ditto.

Co-Authored-By: Kito Cheng <kito.cheng@gmail.com>
Co-Authored-By: Shiva Chen <shiva0217@gmail.com>
From-SVN: r270361