javac-wrapper: refactoring, fixes and tests

compiler/testData/compileKotlinAgainstJava/EnumValues.java

@@ -0,0 +1,18 @@
+package test;
+
+public enum EnumValues {
+    OK(0),
+    COMPILATION_ERROR(1),
+    INTERNAL_ERROR(2),
+    SCRIPT_EXECUTION_ERROR(3);
+
+    private final int code;
+
+    EnumValues(int code) {
+        this.code = code;
+    }
+
+    public int getCode() {
+        return code;
+    }
+}