Allow more fine-grained suppression of ConstructorInvokesOverridable

[Stephan202]

Consider the following code:

final class Container {
    @SuppressWarnings("ConstructorInvokesOverridable")
    abstract static class Test1 {
        private final Class<?> type = myType();

        abstract Class<?> myType();
    }

    abstract static class Test2 {
        @SuppressWarnings("ConstructorInvokesOverridable")
        private final Class<?> type = myType();

        abstract Class<?> myType();
    }

    abstract static class Test3 {
        @SuppressWarnings("ConstructorInvokesOverridable")
        Test3() {
            myType();
        }

        abstract Class<?> myType();
    }
}

Running with -Xep:ConstructorInvokesOverridable:ERROR yields:

Container.java:11: error: [ConstructorInvokesOverridable] Constructors should not invoke overridable methods.
        private final Class<?> type = myType();
                                            ^
    (see http://errorprone.info/bugpattern/ConstructorInvokesOverridable)
Container.java:19: error: [ConstructorInvokesOverridable] Constructors should not invoke overridable methods.
            myType();
                  ^
    (see http://errorprone.info/bugpattern/ConstructorInvokesOverridable)
2 errors

As you can see, no error is emitted for Test1. But for the other two classes @SuppressWarnings("ConstructorInvokesOverridable") has no effect.

For classes with many fields or much code in initializer blocks/constructors, it'd be nice if ConstructorInvokesOverridable could be suppressed at a scope smaller than the whole class. (Refactoring the affected classes would be even better, of course, but alas.)

[Stephan202]

A fix for this issue is part of #1449.