refactor: remove invalid comment

Comment refers to code that has since been changed and is no longer valid.

Author: jwagenleitner

src/main/org/codehaus/groovy/ast/GenericsType.java

@@ -377,8 +377,6 @@ private boolean compareGenericsWithBound(final ClassNode classNode, final ClassN
             for (int i = 0; redirectBoundGenericTypes!=null && i < redirectBoundGenericTypes.length && match; i++) {
                 GenericsType redirectBoundType = redirectBoundGenericTypes[i];
                 GenericsType classNodeType = cnTypes[i];
-                // The following code has been commented out because it causes GROOVY-5415
-                // However, commenting doesn't make any test fail, which is curious...
                 if (classNodeType.isPlaceholder()) {
                     String name = classNodeType.getName();
                     if (redirectBoundType.isPlaceholder()) {