[NDS32] Add intrinsic functions for cache control.

[NDS32] Add intrinsic functions for cache control.

gcc/
	* config/nds32/constants.md (unspec_volatile_element): Add cache
	control enum values.
	* config/nds32/nds32-intrinsic.c: Add cache control expand functions.
	* config/nds32/nds32-intrinsic.md: Add cache control patterns.
	* config/nds32/nds32.c (nds32_cctl_names): New.
	(nds32_print_operand): Handle cache control register names.
	* config/nds32/nds32.h (nds32_builtins): New enum values.
	* config/nds32/nds32_intrinsic.h: Add cache control enum types and
	macros.
	* config/nds32/nds32.md (type): Add mmu.
	* config/nds32/pipelines.md (simple_insn): Add mmu.

From-SVN: r259205