Push Guava singularizer instances down from JavacJavaUtilSingularizer

src/core/lombok/javac/handlers/singulars/JavacJavaUtilListSetSingularizer.java

@@ -44,6 +44,7 @@ import com.sun.tools.javac.util.ListBuffer;
 import com.sun.tools.javac.util.Name;
 
 abstract class JavacJavaUtilListSetSingularizer extends JavacJavaUtilSingularizer {
+	private final JavacSingularizer guavaListSetSingularizer = new JavacGuavaSetListSingularizer();
 
 	@Override protected JavacSingularizer getGuavaInstead(JavacNode node) {
 		return guavaListSetSingularizer;

src/core/lombok/javac/handlers/singulars/JavacJavaUtilMapSingularizer.java

@@ -49,6 +49,8 @@ import com.sun.tools.javac.util.Name;
 
 @ProviderFor(JavacSingularizer.class)
 public class JavacJavaUtilMapSingularizer extends JavacJavaUtilSingularizer {
+	private final JavacSingularizer guavaMapSingularizer = new JavacGuavaMapSingularizer();
+
 	@Override public LombokImmutableList<String> getSupportedTypes() {
 		return LombokImmutableList.of("java.util.Map", "java.util.SortedMap", "java.util.NavigableMap");
 	}

src/core/lombok/javac/handlers/singulars/JavacJavaUtilSingularizer.java

@@ -39,8 +39,6 @@ import lombok.javac.handlers.JavacSingularsRecipes.JavacSingularizer;
 import lombok.javac.handlers.JavacSingularsRecipes.SingularData;
 
 abstract class JavacJavaUtilSingularizer extends JavacSingularizer {
-	protected final JavacSingularizer guavaListSetSingularizer = new JavacGuavaSetListSingularizer();
-	protected final JavacSingularizer guavaMapSingularizer = new JavacGuavaMapSingularizer();
 	
 	protected List<JCStatement> createJavaUtilSetMapInitialCapacitySwitchStatements(JavacTreeMaker maker, SingularData data, JavacNode builderType, boolean mapMode, String emptyCollectionMethod, String singletonCollectionMethod, String targetType, JCTree source, String builderVariable) {
 		List<JCExpression> jceBlank = List.nil();