8246704: --release => \"unknown enum constant PreviewFeature$Feature.TEXT_BLOCKS\"

Use a synthetic annotation instead of inaccessible jdk.internal.PreviewFeature in ct.sym, and avoid resolving that annotation, to prevent errors being printed for the inaccessible types.

Reviewed-by: jlaskey

test/langtools/tools/javac/platform/PreviewAPIsWithRelease.java

@@ -0,0 +1,15 @@
+/**
+ * @test /nodynamiccopyright/
+ * @bug 8246704
+ * @summary Verify preview APIs are reported correctly when using --release.
+ * @compile/fail/ref=PreviewAPIsWithRelease.out -XDrawDiagnostics --release 14 PreviewAPIsWithRelease.java
+ */
+
+import com.sun.source.tree.Tree.Kind;
+
+public class PreviewAPIsWithRelease {
+    void test() {
+        "".stripIndent();
+        Kind r = Kind.RECORD;
+    }
+}