[JPS] Fix incremental build after changing Java enum used in Kotlin when

EnumWhenTracker implemented for tracking changed java enum class items, that used in kotlin when expression.

#KT-47824 Fixed

build-common/src/org/jetbrains/kotlin/incremental/EnumWhenTrackerImpl.kt

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2010-2021 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.incremental
+
+import org.jetbrains.kotlin.incremental.components.EnumWhenTracker
+import java.util.concurrent.ConcurrentHashMap
+
+@Suppress("unused")
+class EnumWhenTrackerImpl: EnumWhenTracker {
+    private val whenExpressionFilePathToEnumClass = ConcurrentHashMap<String, MutableSet<String>>()
+
+    val whenExpressionFilePathToEnumClassMap: Map<String, Collection<String>>
+        get() = whenExpressionFilePathToEnumClass
+
+    override fun report(whenExpressionFilePath: String, enumClassFqName: String) {
+        whenExpressionFilePathToEnumClass.getOrPut(whenExpressionFilePath) { hashSetOf() }.add(enumClassFqName)
+    }
+}