RISC-V: Clarify vlmax and length handling.

This patch tries to improve the wrappers that emit either vlmax or
non-vlmax operations.  Now, emit_len_op can be used to
emit a regular operation.  Depending on whether a length != NULL
is passed either no VLMAX flags are set or we emit a vsetvli and
set VLMAX flags.  The patch also adds some comments that describes
some of the rationale of the current handling of vlmax/nonvlmax
operations.

gcc/ChangeLog:

	* config/riscv/autovec.md: Use renamed functions.
	* config/riscv/riscv-protos.h (emit_vlmax_op): Rename.
	(emit_vlmax_reg_op): To this.
	(emit_nonvlmax_op): Rename.
	(emit_len_op): To this.
	(emit_nonvlmax_binop): Rename.
	(emit_len_binop): To this.
	* config/riscv/riscv-v.cc (emit_pred_op): Add default parameter.
	(emit_pred_binop): Remove vlmax_p.
	(emit_vlmax_op): Rename.
	(emit_vlmax_reg_op): To this.
	(emit_nonvlmax_op): Rename.
	(emit_len_op): To this.
	(emit_nonvlmax_binop): Rename.
	(emit_len_binop): To this.
	(sew64_scalar_helper): Use renamed functions.
	(expand_tuple_move): Use renamed functions.
	* config/riscv/riscv.cc (vector_zero_call_used_regs): Use
	renamed functions.
	* config/riscv/vector.md: Use renamed functions.

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