FIC: add codegen tests, adapt previously tests for SAMs

compiler/testData/codegen/box/funInterface/castFromAny.kt

@@ -0,0 +1,18 @@
+// !LANGUAGE: +NewInference +FunctionInterfaceConversion +SamConversionPerArgument +SamConversionForKotlinFunctions
+
+fun interface KRunnable {
+    fun invoke()
+}
+
+fun test(a: Any?) {
+    a as () -> Unit
+    KRunnable(a).invoke()
+}
+
+fun box(): String {
+    var result = "Fail"
+    test {
+        result = "OK"
+    }
+    return result
+}