Improved assembler performance

src/asm/Number.go

@@ -18,8 +18,11 @@ func (data *Number) String() string {
 func (a *Assembler) Number(mnemonic Mnemonic, number int) {
 	a.Instructions = append(a.Instructions, Instruction{
 		Mnemonic: mnemonic,
-		Data: &Number{
-			Number: number,
-		},
+		Type:     TypeNumber,
+		Index:    Index(len(a.Param.Number)),
+	})
+
+	a.Param.Number = append(a.Param.Number, Number{
+		Number: number,
 	})
 }