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

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

@@ -0,0 +1,14 @@
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+// SAM_CONVERSIONS: CLASS
+
+fun interface GenericToAny<T> {
+    fun invoke(Inner: T): Any
+}
+
+fun <T> foo2(t: T, g: GenericToAny<T>): Any = g.invoke(t)
+
+fun box(): String {
+    foo2<Char>('.') {  }
+    return "OK"
+}