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

compiler/testData/diagnostics/tests/syntheticExtensions/javaProperties/GenericClass.kt

@@ -0,0 +1,10 @@
+// FILE: KotlinFile.kt
+fun foo(javaClass: JavaClass<String>) {
+    javaClass.something += "x"
+}
+
+// FILE: JavaClass.java
+public class JavaClass<T> {
+    public T getSomething() { return null; }
+    public void setSomething(T value) { }
+}