[AArch64, 2/6] Reimplement vector fixed-point intrinsics

[AArch64, 2/6] Reimplement vector fixed-point intrinsics

	* config/aarch64/aarch64-builtins.def (scvtf): Register vector modes.
	(ucvtf): Likewise.
	(fcvtzs): Likewise.
	(fcvtzu): Likewise.
	* config/aarch64/aarch64-simd.md
	(<FCVT_F2FIXED:fcvt_fixed_insn><VDQF:mode>3): New.
	(<FCVT_FIXED2F:fcvt_fixed_insn><VDQ_SDI:mode>3): Likewise.
	* config/aarch64/arm_neon.h (vcvt_n_f32_s32): Remove inline assembly.
	Use builtin.
	(vcvt_n_f32_u32): Likewise.
	(vcvt_n_s32_f32): Likewise.
	(vcvt_n_u32_f32): Likewise.
	(vcvtq_n_f32_s32): Likewise.
	(vcvtq_n_f32_u32): Likewise.
	(vcvtq_n_f64_s64): Likewise.
	(vcvtq_n_f64_u64): Likewise.
	(vcvtq_n_s32_f32): Likewise.
	(vcvtq_n_s64_f64): Likewise.
	(vcvtq_n_u32_f32): Likewise.
	(vcvtq_n_u64_f64): Likewise.
	* config/aarch64/iterators.md (VDQ_SDI): New mode iterator.
	(VSDQ_SDI): Likewise.
	(fcvt_target): Support V4DI, V4SI and V2SI.
	(FCVT_TARGET): Likewise.

From-SVN: r237201