Introduce predefined enhancement info

It can be used to specify enhanced signature for standard JDK methods
without them be actually annotated

 #KT-9194 In Progress
 #KT-5175 In Progress
 #KT-10370 In Progress
 #KT-7127 In Progress

compiler/testData/diagnostics/testsWithJava8/targetedBuiltIns/forEachRemainingNullability.kt

@@ -0,0 +1,39 @@
+import java.util.function.Consumer
+
+abstract class MyIt1<out T> : Iterator<T> {
+    override fun forEachRemaining(x: Consumer<in T>) {}
+}
+
+abstract class MyIt2<out T> : Iterator<T> {
+    <!NOTHING_TO_OVERRIDE!>override<!> fun forEachRemaining(x: Consumer<in T?>) {}
+}
+
+abstract class MyIt3<out T> : Iterator<T> {
+    <!NOTHING_TO_OVERRIDE!>override<!> fun forEachRemaining(x: Consumer<in T>?) {}
+}
+
+abstract class MyIt4 : Iterator<String?> {
+    override fun forEachRemaining(x: Consumer<in String?>) {}
+}
+
+abstract class MyIt5 : Iterator<String> {
+    override fun forEachRemaining(x: Consumer<in String>) {}
+}
+
+abstract class MyIt6 : Iterator<String?> {
+    <!NOTHING_TO_OVERRIDE!>override<!> fun forEachRemaining(x: Consumer<in String>) {}
+}
+
+abstract class MyIt7 : Iterator<String> {
+    <!NOTHING_TO_OVERRIDE!>override<!> fun forEachRemaining(x: Consumer<in String?>) {}
+}
+
+
+fun foo(x: Iterator<String>, y: Iterator<String?>) {
+    x.<!TYPE_INFERENCE_INCORPORATION_ERROR!>forEachRemaining<!>(<!NULL_FOR_NONNULL_TYPE!>null<!>)
+
+    x.forEachRemaining { it -> it.length }
+    x.forEachRemaining { it -> it<!UNNECESSARY_SAFE_CALL!>?.<!>length }
+    y.forEachRemaining { it -> it<!UNSAFE_CALL!>.<!>length }
+    y.forEachRemaining { it -> it?.length }
+}