aarch64: Relaxed SEL combiner patterns for unpacked SVE FP binary arithmetic

aarch64: Relaxed SEL combiner patterns for unpacked SVE FP binary arithmetic

Extend the binary op/UNSPEC_SEL combiner patterns from SVE_FULL_F/
SVE_FULL_F_B16B16 to SVE_F/SVE_F_B16B16, where the strictness value
is SVE_RELAXED_GP.

gcc/ChangeLog:

	* config/aarch64/aarch64-sve.md (*cond_<optab><mode>_2_relaxed):
	Extend from SVE_FULL_F_B16B16 to SVE_F_B16B16.
	(*cond_<optab><mode>_3_relaxed): Likewise.
	(*cond_<optab><mode>_any_relaxed): Likwise.
	(*cond_<optab><mode>_any_const_relaxed): Extend from SVE_FULL_F
	to SVE_F.
	(*cond_add<mode>_2_const_relaxed): Likewise.
	(*cond_add<mode>_any_const_relaxed): Likewise.
	(*cond_sub<mode>_3_const_relaxed): Likewise.
	(*cond_sub<mode>_const_relaxed): Likewise.

gcc/testsuite/ChangeLog:

	* g++.target/aarch64/sve/unpacked_cond_binary_bf16_1.C: New test.
	* gcc.target/aarch64/sve/unpacked_cond_builtin_fmax_1.c: Likewise.
	* gcc.target/aarch64/sve/unpacked_cond_builtin_fmin_1.c: Likewise.
	* gcc.target/aarch64/sve/unpacked_cond_fadd_1.c: Likewise.
	* gcc.target/aarch64/sve/unpacked_cond_fdiv_1.c: Likewise.
	* gcc.target/aarch64/sve/unpacked_cond_fmaxnm_1.c: Likewise.
	* gcc.target/aarch64/sve/unpacked_cond_fminnm_1.c: Likewise.
	* gcc.target/aarch64/sve/unpacked_cond_fmul_1.c: Likewise..
	* gcc.target/aarch64/sve/unpacked_cond_fsubr_1.c: Likewise.