JetDiagnosticsTest for using java enum in kotlin.

compiler/testData/diagnostics/tests/enum/javaEnumWithNameClashing.kt

@@ -0,0 +1,17 @@
+// FILE: A.java
+public enum A {
+    ENTRY,
+    ANOTHER;
+
+    public String ENTRY = "";
+}
+
+// FILE: test.kt
+
+package vvv
+
+fun main() {
+    val c: A = A.ENTRY
+    val <!UNUSED_VARIABLE!>c2<!>: String? = c.ENTRY
+    val <!UNUSED_VARIABLE!>c3<!>: String? = A.ANOTHER.ENTRY
+}