feat(arch): the FP8-to-halfword conversion pairs

Assisted-by: GLM 5.3 Flash

asm/arm64_ext_asm_test.go

@@ -814,6 +814,10 @@ func TestArm64AssembleExtensionStage4Golden(t *testing.T) {
 		{"ZBF1CVTLT Z11.B, Z6.H", 0x65093966},
 		{"ZBF2CVT Z11.B, Z6.H", 0x65083d66},
 		{"ZBF2CVTLT Z11.B, Z6.H", 0x65093d66},
+		{"ZF1CVT Z11.B, Z6.H", 0x65083166},
+		{"ZF1CVTLT Z11.B, Z6.H", 0x65093166},
+		{"ZF2CVT Z11.B, Z6.H", 0x65083566},
+		{"ZF2CVTLT Z11.B, Z6.H", 0x65093566},
 		{"ZBFADD Z23.H, Z13.H, P1.M, Z13.H", 0x650086ed},
 		{"ZBFADD Z7.H, Z6.H, Z23.H", 0x650700d7},
 		{"ZBFCLAMP Z7.H, Z6.H, Z23.H", 0x642724d7},