多参数打印加空格分隔

_examples/strbytes.wa

 func main() {
+	println("a:", 42)
 	str := "hello"
 	bytes := []byte(str)
 	for _, c := range bytes {

internal/backends/compiler_wat/compile_func.go

@@ -594,13 +594,18 @@ func (g *functionGenerator) genBuiltin(call *ssa.CallCommon) (insts []wat.Inst,
 		}
 
 	case "print", "println":
-		for _, arg := range call.Args {
+		for i, arg := range call.Args {
 			av := g.getValue(arg).value
 			avt := av.Type()
 			if ut, ok := avt.(*wir.Dup); ok {
 				avt = ut.Base
 			}
 
+			if i > 0 {
+				insts = append(insts, wat.NewInstConst(wat.I32{}, "32"))
+				insts = append(insts, wat.NewInstCall("$runtime.waPrintRune"))
+			}
+
 			if avt.Equal(g.module.U8) || avt.Equal(g.module.I8) ||
 				avt.Equal(g.module.U16) || avt.Equal(g.module.I16) ||
 				avt.Equal(g.module.I32) || avt.Equal(g.module.U32) {
@@ -620,7 +625,6 @@ func (g *functionGenerator) genBuiltin(call *ssa.CallCommon) (insts []wat.Inst,
 			} else {
 				logger.Fatalf("Todo: print(%T)", avt)
 			}
-
 		}
 
 		if call.Value.Name() == "println" {