reflect,reflectlite: make IsRO/MakeRO package methods

Having them as methods on reflectlite.Value makes them
visible to the user.

Also move new functions out of all_test.go so it can stay
closer to upstream (except for comments).

src/reflect/all_test.go

@@ -4722,14 +4722,6 @@ var convertTests = []struct {
 
 }
 
-func IsRO(v Value) bool {
-	return v.IsRO()
-}
-
-func MakeRO(v Value) Value {
-	return Value{v.MakeRO(true)}
-}
-
 func TestConvert(t *testing.T) {
 	canConvert := map[[2]Type]bool{}
 	all := map[Type]bool{}

src/reflect/value_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/base64"
 	"fmt"
+	"internal/reflectlite"
 	. "reflect"
 	"runtime"
 	"slices"
@@ -992,3 +993,13 @@ func TestTypeAssertPanic(t *testing.T) {
 		t.Fatalf("TypeAssert did not panic")
 	})
 }
+
+// Functions needed by all_test.go
+
+func IsRO(v Value) bool {
+	return reflectlite.IsRO(v.Value)
+}
+
+func MakeRO(v Value) Value {
+	return Value{reflectlite.MakeRO(v.Value, true)}
+}