JVM_IR indy-SAM: function reference to Java interface

compiler/testData/codegen/box/invokedynamic/sam/enhancedNullabilityMix.kt

@@ -0,0 +1,29 @@
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+// SAM_CONVERSIONS: INDY
+// FILE: enhancedNullability.kt
+fun interface IGetInt {
+    fun get(x: Int): Int
+}
+
+// fun interface IGetIntMix0 : IGetInt, Sam
+// ^ Error: [FUN_INTERFACE_WRONG_COUNT_OF_ABSTRACT_MEMBERS] Fun interfaces must have exactly one abstract method
+
+fun interface IGetIntMix1 : IGetInt, Sam {
+    override fun get(x: Int): Int
+}
+
+fun box(): String {
+    val t1 = IGetIntMix1 { it: Int -> it * 2 }.get(21)
+    if (t1 != 42)
+        return "Failed: t1=$t1"
+
+    return "OK"
+}
+
+// FILE: Sam.java
+import org.jetbrains.annotations.*;
+
+public interface Sam {
+    @NotNull Integer get(@NotNull Integer arg);
+}