JVM_IR indy-SAM: KT-45069 box lambda 'Unit' return type if needed

compiler/testData/codegen/box/invokedynamic/sam/specializedGenerics/inheritedWithChar.kt

@@ -1,7 +1,6 @@
 // TARGET_BACKEND: JVM
 // JVM_TARGET: 1.8
 // SAM_CONVERSIONS: INDY
-// IGNORE_DEXING
 
 fun interface GenericToAny<T> {
     fun invoke(x: T): Any
@@ -12,4 +11,4 @@ fun interface GenericCharToAny : GenericToAny<Char>
 fun withK(fn: GenericCharToAny) = fn.invoke('K').toString()
 
 fun box(): String =
-    withK { "O" + it }
+    withK { "O" + it }