[AArch64, 1/4] Add the missing support of vfms_n_f32, vfmsq_n_f32, vfmsq_n_f64

[AArch64, 1/4]  Add the missing support of vfms_n_f32, vfmsq_n_f32, vfmsq_n_f64

gcc/
	* config/aarch64/aarch64-simd.md (*aarch64_fma4_elt_to_128df): Rename
	to *aarch64_fma4_elt_from_dup<mode>.
	(*aarch64_fnma4_elt_to_128df): Rename to
	*aarch64_fnma4_elt_from_dup<mode>.
	* config/aarch64/arm_neon.h (vfma_n_f64): New.
	(vfms_n_f32): Likewise.
	(vfms_n_f64): Likewise.
	(vfmsq_n_f32): Likewise.
	(vfmsq_n_f64): Likewise.

gcc/testsuite/
	* gcc.target/aarch64/fmla_intrinsic_1.c: Allow ".d[index]" besides
	".2d[index]" when scan the assembly.
	* gcc.target/aarch64/fmls_intrinsic_1.c: Likewise.
	* gcc.target/aarch64/advsimd-intrinsics/arm-neon-ref.h: New entry for
	float64x1.
	* gcc.target/aarch64/advsimd-intrinsics/vfms_vfma_n.c: New.

From-SVN: r236331