[IR] Add IrMessageLogger interface for diagnostic reporting from IR

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/IrMessageLogger.kt

@@ -0,0 +1,28 @@
+/*
+ * 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.ir.util
+
+import org.jetbrains.kotlin.config.CompilerConfigurationKey
+
+interface IrMessageLogger {
+
+    enum class Severity {
+        INFO, WARNING, ERROR
+    }
+
+    data class Location(val filePath: String, val line: Int, val column: Int)
+
+    fun report(severity: Severity, message: String, location: Location?)
+
+    object None : IrMessageLogger {
+        override fun report(severity: Severity, message: String, location: Location?) {}
+    }
+
+    companion object {
+        @JvmStatic
+        val IR_MESSAGE_LOGGER = CompilerConfigurationKey<IrMessageLogger>("ir message logger")
+    }
+}