Minor, add missing copyright to compiler modules

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/DumpIrTreeWithDescriptorsVisitor.kt

@@ -1,3 +1,8 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. 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.backend.common
 
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/Ir.kt

@@ -1,3 +1,8 @@
+ /*
+ * Copyright 2010-2019 JetBrains s.r.o. 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.backend.common.ir
 
 import org.jetbrains.kotlin.backend.common.CommonBackendContext

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/phaser/DumperVerifier.kt

@@ -1,3 +1,8 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. 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.backend.common.phaser
 
 import org.jetbrains.kotlin.backend.common.CommonBackendContext

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/phaser/PhaseBuilders.kt

@@ -1,3 +1,8 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. 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.backend.common.phaser
 
 import org.jetbrains.kotlin.backend.common.CommonBackendContext

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/phaser/PhaseConfig.kt

@@ -1,3 +1,8 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. 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.backend.common.phaser
 
 import org.jetbrains.kotlin.config.CommonConfigurationKeys