Revert "Revert "[light classes] drop old light classes and backend: iteration #9""

This reverts commit 38c623bc3a.

compiler/tests-common/tests/org/jetbrains/kotlin/checkers/BaseDiagnosticsTest.kt

@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2022 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.checkers
@@ -23,7 +12,6 @@ import com.intellij.openapi.util.TextRange
 import com.intellij.psi.search.GlobalSearchScope
 import com.intellij.psi.util.PsiTreeUtil
 import com.intellij.util.containers.ContainerUtil
-import org.jetbrains.kotlin.asJava.getJvmSignatureDiagnostics
 import org.jetbrains.kotlin.checkers.BaseDiagnosticsTest.TestFile
 import org.jetbrains.kotlin.checkers.BaseDiagnosticsTest.TestModule
 import org.jetbrains.kotlin.checkers.diagnostics.ActualDiagnostic
@@ -34,6 +22,7 @@ import org.jetbrains.kotlin.checkers.diagnostics.factories.SyntaxErrorDiagnostic
 import org.jetbrains.kotlin.checkers.utils.CheckerTestUtil
 import org.jetbrains.kotlin.checkers.utils.DiagnosticsRenderingConfiguration
 import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
+import org.jetbrains.kotlin.cli.jvm.compiler.getJvmSignatureDiagnostics
 import org.jetbrains.kotlin.config.*
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.descriptors.impl.ModuleDescriptorImpl
@@ -56,7 +45,6 @@ import org.jetbrains.kotlin.test.util.KtTestUtil
 import org.jetbrains.kotlin.utils.addIfNotNull
 import org.junit.Assert
 import java.io.File
-import java.util.*
 import java.util.regex.Pattern
 import kotlin.reflect.jvm.javaField