RISC-V: Add runtime invariant support

RISC-V 'V' Extension support scalable vector like ARM SVE.
To support RVV, we need to introduce runtime invariant.

- For zve32*, the runtime invariant uses 32-bit chunk.
- For zve64*, the runtime invariant uses 64-bit chunk.

[1] https://github.com/riscv/riscv-v-spec/blob/master/v-spec.adoc#sec-vector-extensions

This patch is preparing patch for RVV support.
Because we didn't introduce vector machine_mode yet, it safe to just change HOST_WIDE_INT into poly_int.
Also it safe to use "to_constant()" function for scalar operation.
This patch has been tested by full dejagnu regression.

gcc/ChangeLog:

	* config/riscv/predicates.md: Adjust runtime invariant.
	* config/riscv/riscv-modes.def (MAX_BITSIZE_MODE_ANY_MODE): New.
	(NUM_POLY_INT_COEFFS): New.
	* config/riscv/riscv-protos.h (riscv_initial_elimination_offset):Adjust
	runtime invariant.
	* config/riscv/riscv-sr.cc (riscv_remove_unneeded_save_restore_calls):
	Adjust runtime invariant.
	* config/riscv/riscv.cc (struct riscv_frame_info): Adjust runtime
	invariant.
	(enum riscv_microarchitecture_type): Ditto.
	(riscv_valid_offset_p): Ditto.
	(riscv_valid_lo_sum_p): Ditto.
	(riscv_address_insns): Ditto.
	(riscv_load_store_insns): Ditto.
	(riscv_legitimize_move): Ditto.
	(riscv_binary_cost): Ditto.
	(riscv_rtx_costs): Ditto.
	(riscv_output_move): Ditto.
	(riscv_extend_comparands): Ditto.
	(riscv_flatten_aggregate_field): Ditto.
	(riscv_get_arg_info): Ditto.
	(riscv_pass_by_reference): Ditto.
	(riscv_elf_select_rtx_section): Ditto.
	(riscv_stack_align): Ditto.
	(riscv_compute_frame_info): Ditto.
	(riscv_initial_elimination_offset): Ditto.
	(riscv_set_return_address): Ditto.
	(riscv_for_each_saved_reg): Ditto.
	(riscv_first_stack_step): Ditto.
	(riscv_expand_prologue): Ditto.
	(riscv_expand_epilogue): Ditto.
	(riscv_can_use_return_insn): Ditto.
	(riscv_secondary_memory_needed): Ditto.
	(riscv_hard_regno_nregs): Ditto.
	(riscv_convert_vector_bits): New.
	(riscv_option_override): Adjust runtime invariant.
	(riscv_promote_function_mode): Ditto.
	* config/riscv/riscv.h (POLY_SMALL_OPERAND_P): New.
	(BITS_PER_RISCV_VECTOR): New.
	(BYTES_PER_RISCV_VECTOR): New.
	* config/riscv/riscv.md: Adjust runtime invariant.

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