[NDS32] Implment n10 pipeline.

[NDS32] Implment n10 pipeline.

gcc/
	* config.gcc (nds32*-*-*): Check that n10/d10 are valid to --with-cpu.
	* config/nds32/nds32-n10.md: New file.
	* config/nds32/nds32-opts.h (nds32_cpu_type): Add CPU_N10.
	* config/nds32/nds32-pipelines-auxiliary.c: Implementation for n10
	pipeline.
	* config/nds32/nds32-protos.h: More declarations for n10 pipeline.
	* config/nds32/nds32-utils.c: More implementations for n10 pipeline.
	* config/nds32/nds32.md (pipeline_model): Add n10.
	* config/nds32/nds32.opt (mcpu): Support n10 pipeline cpus.
	* config/nds32/pipelines.md: Include n10 settings.

Co-Authored-By: Chung-Ju Wu <jasonwucj@gmail.com>
From-SVN: r260207