Don't generate default no-args constructor for enums

#KT-8438 Fixed

compiler/testData/codegen/box/enum/publicConstructorWithDefault.kt

@@ -0,0 +1,9 @@
+// KT-8438 org.jetbrains.org.objectweb.asm.tree.analysis.AnalyzerException: Error at instruction 4: Cannot pop operand off an empty stack
+
+enum class E public constructor(x: String = "OK") {
+    ENTRY();
+
+    val result = x
+}
+
+fun box(): String = E.ENTRY.result