[K/Wasm] Convert non-capturing lambdas into singletons ^KT-64803 Fixed

compiler/testData/codegen/box/closures/closuresAsSingleton.kt

@@ -0,0 +1,7 @@
+// KT-64803
+
+fun generateClosure(): () -> Unit = {}
+
+fun box(): String {
+    return if (generateClosure().hashCode() != generateClosure().hashCode()) "Fail: hashCode are not equals" else "OK"
+}