[AArch64] Implement intrinsics for SVE FAMIN/FAMAX (#99042)

This patch implements the following intrinsics:

* Floating-point absolute maximum (predicated)

svfloat16_t svamax[_f16]_m(svbool_t, svfloat16_t, svfloat16_t);
svfloat16_t svamax[_f16]_x(svbool_t, svfloat16_t, svfloat16_t);
svfloat16_t svamax[_f16]_z(svbool_t, svfloat16_t, svfloat16_t);

svfloat16_t svamax[_n_f16]_m(svbool_t, svfloat16_t, float16_t);
svfloat16_t svamax[_n_f16]_x(svbool_t, svfloat16_t, float16_t);
svfloat16_t svamax[_n_f16]_z(svbool_t, svfloat16_t, float16_t);

* Floating-point absolute minimum (predicated)

svfloat16_t svmin[_f16]_m(svbool_t, svfloat16_t, svfloat16_t);
svfloat16_t svmin[_f16]_x(svbool_t, svfloat16_t, svfloat16_t);
svfloat16_t svmin[_f16]_z(svbool_t, svfloat16_t, svfloat16_t);

svfloat16_t svmin[_n_f16]_m(svbool_t, svfloat16_t, float16_t);
svfloat16_t svmin[_n_f16]_x(svbool_t, svfloat16_t, float16_t);
svfloat16_t svmin[_n_f16]_z(svbool_t, svfloat16_t, float16_t);

All the intrinsics have also variants for `f32` and `f64`, and have the
`__arm_streaming` attribute.

(cf. ARM-software/acle#324)

Author: momchil-velikov

clang/include/clang/Basic/arm_sve.td

@@ -2418,4 +2418,9 @@ let SVETargetGuard = "sve2p1", SMETargetGuard = "sme2" in {
 
   def SVBFMLSLB_LANE : SInst<"svbfmlslb_lane[_{d}]", "dd$$i", "f", MergeNone, "aarch64_sve_bfmlslb_lane", [IsOverloadNone, VerifyRuntimeMode], [ImmCheck<3, ImmCheck0_7>]>;
   def SVBFMLSLT_LANE : SInst<"svbfmlslt_lane[_{d}]", "dd$$i", "f", MergeNone, "aarch64_sve_bfmlslt_lane", [IsOverloadNone, VerifyRuntimeMode], [ImmCheck<3, ImmCheck0_7>]>;
-}
+}
+
+let SVETargetGuard = "sve2,faminmax", SMETargetGuard = "sme2,faminmax" in {
+  defm SVAMIN : SInstZPZZ<"svamin", "hfd", "aarch64_sve_famin", "aarch64_sve_famin_u">;
+  defm SVAMAX : SInstZPZZ<"svamax", "hfd", "aarch64_sve_famax", "aarch64_sve_famax_u">;
+}