Implemented more arm64 instructions

src/arm/Div.go

@@ -0,0 +1,8 @@
+package arm
+
+import "git.urbach.dev/cli/q/src/cpu"
+
+// DivSigned divides source by operand and stores the value in the destination.
+func DivSigned(destination cpu.Register, source cpu.Register, operand cpu.Register) uint32 {
+	return 0b10011010110<<21 | 0b000011<<10 | reg3(destination, source, operand)
+}