JVM_IR indy-SAM: function reference to Java interface

compiler/testData/codegen/box/invokedynamic/sam/functionRefToJavaInterface/enhancedNullability.kt

@@ -0,0 +1,20 @@
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
+// JVM_TARGET: 1.8
+// SAM_CONVERSIONS: INDY
+// FILE: enhancedNullability.kt
+fun mul2(x: Int) = x * 2
+
+fun box(): String {
+    val t = Sam(::mul2).get(21)
+    if (t != 42)
+        return "Failed: t=$t"
+    return "OK"
+}
+
+// FILE: Sam.java
+import org.jetbrains.annotations.*;
+
+public interface Sam {
+    @NotNull Integer get(@NotNull Integer arg);
+}