Forbid usage of outer's generic parameter in nested class

#KT-1174 In Progress

compiler/testData/diagnostics/tests/PrimaryConstructors.kt

@@ -19,7 +19,7 @@ class MyIterable<T> : Iterable<T>
 {
     override fun iterator(): Iterator<T>  = MyIterator()
 
-    class MyIterator : Iterator<T>
+    inner class MyIterator : Iterator<T>
     {
         override fun hasNext(): Boolean = false
         override fun next(): T {

compiler/testData/diagnostics/tests/inner/outerGenericParam.kt

@@ -0,0 +1,13 @@
+class Outer<T> {
+    class Nested {
+        fun foo(t: <!INACCESSIBLE_OUTER_CLASS_EXPRESSION!>T<!>) = t
+    }
+    
+    class Nested2<T> {
+        fun foo(t: T) = t
+    }
+    
+    inner class Inner {
+        fun foo(t: T) = t
+    }
+}