aarch64: Use SVE's RDVL instruction

We didn't previously use SVE's RDVL instruction, since the CNT*
forms are preferred and provide most of the range.  However,
there are some cases that RDVL can handle and CNT* can't,
and using RDVL-like instructions becomes important for SME.

gcc/
	* config/aarch64/aarch64-protos.h (aarch64_sve_rdvl_immediate_p)
	(aarch64_output_sve_rdvl): Declare.
	* config/aarch64/aarch64.cc (aarch64_sve_cnt_factor_p): New
	function, split out from...
	(aarch64_sve_cnt_immediate_p): ...here.
	(aarch64_sve_rdvl_factor_p): New function.
	(aarch64_sve_rdvl_immediate_p): Likewise.
	(aarch64_output_sve_rdvl): Likewise.
	(aarch64_offset_temporaries): Rewrite the SVE handling to use RDVL
	for some cases.
	(aarch64_expand_mov_immediate): Handle RDVL immediates.
	(aarch64_mov_operand_p): Likewise.
	* config/aarch64/constraints.md (Usr): New constraint.
	* config/aarch64/aarch64.md (*mov<SHORT:mode>_aarch64): Add an RDVL
	alternative.
	(*movsi_aarch64, *movdi_aarch64): Likewise.

gcc/testsuite/
	* gcc.target/aarch64/sve/acle/asm/cntb.c: Tweak expected output.
	* gcc.target/aarch64/sve/acle/asm/cnth.c: Likewise.
	* gcc.target/aarch64/sve/acle/asm/cntw.c: Likewise.
	* gcc.target/aarch64/sve/acle/asm/cntd.c: Likewise.
	* gcc.target/aarch64/sve/acle/asm/prfb.c: Likewise.
	* gcc.target/aarch64/sve/acle/asm/prfh.c: Likewise.
	* gcc.target/aarch64/sve/acle/asm/prfw.c: Likewise.
	* gcc.target/aarch64/sve/acle/asm/prfd.c: Likewise.
	* gcc.target/aarch64/sve/loop_add_4.c: Expect RDVL to be used
	to calculate the -17 and 17 factors.
	* gcc.target/aarch64/sve/pcs/stack_clash_1.c: Likewise the 18 factor.

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