JVM_IR indy-SAM: function reference to Java interface

compiler/testData/codegen/box/invokedynamic/sam/functionExprToJavaInterface/extensionLambda1.kt

@@ -0,0 +1,15 @@
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+// SAM_CONVERSIONS: INDY
+// FILE: extensionLambda1.kt
+fun samExtLambda(ext: String.() -> String) = Sam(ext)
+
+fun box(): String {
+    val oChar = 'O'
+    return samExtLambda { oChar.toString() + this }.get("K")
+}
+
+// FILE: Sam.java
+public interface Sam {
+    String get(String s);
+}