Drop enum class object hack

Place valueOf() and values() into the static scope of the corresponding enum
class

 #KT-5580 Fixed
 #KT-2410 Fixed

compiler/testData/diagnostics/tests/duplicateJvmSignature/synthesized/enumValuesValueOf.kt

@@ -0,0 +1,12 @@
+enum class <!CONFLICTING_JVM_DECLARATIONS, CONFLICTING_JVM_DECLARATIONS!>A<!> {
+    A1
+    A2
+
+    <!CONFLICTING_JVM_DECLARATIONS!>fun valueOf(s: String): A<!> = valueOf(s)
+
+    fun valueOf() = "OK"
+
+    <!CONFLICTING_JVM_DECLARATIONS!>fun values(): Array<A><!> = null!!
+
+    fun values(x: String) = x
+}