Add exports for JDK 21 to Kythe extractor

Change-Id: Ie977f08f8aee59ea21dcbfe7c9c07dc0dc535775
Fixes: 328877412
Test: TH
diff --git a/java/builder.go b/java/builder.go
index b07a622..5d84d0b 100644
--- a/java/builder.go
+++ b/java/builder.go
@@ -120,6 +120,8 @@
 				`--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED ` +
 				`--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED ` +
 				`--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED ` +
+				`--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED ` +
+				`--add-exports=jdk.internal.opt/jdk.internal.opt=ALL-UNNAMED ` +
 				`-jar ${config.JavaKytheExtractorJar} ` +
 				`${config.JavacHeapFlags} ${config.CommonJdkFlags} ` +
 				`$processorpath $processor $javacFlags $bootClasspath $classpath ` +