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

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

@@ -0,0 +1,30 @@
+// FILE: KotlinFile.kt
+class KotlinClass {
+    public fun doSomething(runnable: Runnable) { runnable.run() }
+}
+
+public interface I {
+    public fun doIt()
+}
+
+fun foo(javaClass: JavaClass, kotlinClass: KotlinClass) {
+    javaClass.doSomething {
+        bar()
+    }
+
+    kotlinClass.doSomething <!TYPE_MISMATCH!>{
+        bar()
+    }<!>
+
+    javaClass.doSomething2 <!TYPE_MISMATCH!>{
+        bar()
+    }<!>
+}
+
+fun bar(){}
+
+// FILE: JavaClass.java
+public class JavaClass {
+    public void doSomething(Runnable runnable) { runnable.run(); }
+    public void doSomething2(I i) { i.doIt(); }
+}