Properly check overloads in enum

compiler/testData/diagnostics/tests/duplicateJvmSignature/specialNames/enum.kt

@@ -0,0 +1,7 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+enum class <!CONFLICTING_JVM_DECLARATIONS, CONFLICTING_JVM_DECLARATIONS!>E<!> {
+    A;
+
+    <!CONFLICTING_JVM_DECLARATIONS!>fun values(): Array<E><!> = null!!
+    <!CONFLICTING_JVM_DECLARATIONS!>fun valueOf(s: String): E<!> = null!!
+}