Iniital implementation of synthetic extensions for SAM-adapter functions (non-static only)

compiler/testData/diagnostics/tests/syntheticExtensions/samAdapters/InnerClassInGeneric.kt

@@ -0,0 +1,20 @@
+// FILE: KotlinFile.kt
+fun foo(javaClass: JavaClass<Int>) {
+    val inner = javaClass.createInner<String>()
+    inner.doSomething(1, "") {
+        bar()
+    }
+}
+
+fun bar(){}
+
+// FILE: JavaClass.java
+public class JavaClass<T> {
+    public <X> Inner<X> createInner() {
+        return new Inner<X>();
+    }
+
+    public class Inner<X>{
+        public void doSomething(T t, X x, Runnable runnable) { runnable.run(); }
+    }
+}