[FIR] Introduce new Visibility class which not depends on descriptors

compiler/fir/jvm/src/org/jetbrains/kotlin/fir/JavaVisibilities.kt

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.fir
+
+object JavaVisibilities {
+    object PACKAGE_VISIBILITY : Visibility("package", isPublicAPI = false) {
+        override fun compareTo(visibility: Visibility): Int? {
+            if (this === visibility) return 0
+            if (Visibilities.isPrivate(visibility)) return 1
+            return -1
+        }
+
+        override fun normalize(): Visibility {
+            return Visibilities.PROTECTED
+        }
+
+        override val internalDisplayName: String
+            get() = "public/*package*/"
+    }
+
+    object PROTECTED_STATIC_VISIBILITY : Visibility("protected_static", isPublicAPI = true) {
+        override fun normalize(): Visibility {
+            return Visibilities.PROTECTED
+        }
+
+        override val internalDisplayName: String
+            get() = "protected/*protected static*/"
+    }
+
+    object PROTECTED_AND_PACKAGE : Visibility("protected_and_package", isPublicAPI = true) {
+        override fun compareTo(visibility: Visibility): Int? {
+            if (this == visibility) return 0
+            if (visibility === Visibilities.INTERNAL) return null
+            return if (Visibilities.isPrivate(visibility)) 1 else -1
+        }
+
+        override fun normalize(): Visibility {
+            return Visibilities.PROTECTED
+        }
+
+        override val internalDisplayName: String
+            get() = "protected/*protected and package*/"
+    }
+}