C-SKY: Support -mfloat-abi=hard.

C-SKY: Support -mfloat-abi=hard.

gcc/ChangeLog:

	* config/csky/csky.md (CSKY_NPARM_FREGS): New.
	(call_value_internal_vs/d): New.
	(untyped_call): New.
	* config/csky/csky.h (TARGET_SINGLE_FPU): New.
	(TARGET_DOUBLE_FPU): New.
	(FUNCTION_VARG_REGNO_P): New.
	(CSKY_VREG_MODE_P): New.
	(FUNCTION_VARG_MODE_P): New.
	(CUMULATIVE_ARGS): Add extra regs info.
	(INIT_CUMULATIVE_ARGS): Use csky_init_cumulative_args.
	(FUNCTION_ARG_REGNO_P): Use FUNCTION_VARG_REGNO_P.
	* config/csky/csky-protos.h (csky_init_cumulative_args): Extern.
	* config/csky/csky.c (csky_cpu_cpp_builtins): Support TARGET_HARD_FLOAT_ABI.
	(csky_function_arg): Likewise.
	(csky_num_arg_regs): Likewise.
	(csky_function_arg_advance): Likewise.
	(csky_function_value): Likewise.
	(csky_libcall_value): Likewise.
	(csky_function_value_regno_p): Likewise.
	(csky_arg_partial_bytes): Likewise.
	(csky_setup_incoming_varargs): Likewise.
	(csky_init_cumulative_args): New.

gcc/testsuite/ChangeLog:

	* gcc.dg/builtin-apply2.c : Skip if CSKY.
	* gcc.dg/torture/stackalign/builtin-apply-2.c : Likewise.