IR. Remove ClassLowerWithContext

The code is never used and shows some signs of bit rot.

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/ClassLowerWithContext.kt

@@ -1,62 +0,0 @@
-/*
- * Copyright 2010-2016 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.
- */
-
-package org.jetbrains.kotlin.backend.jvm.lower
-
-import org.jetbrains.kotlin.backend.common.FileLoweringPass
-import org.jetbrains.kotlin.descriptors.ClassDescriptor
-import org.jetbrains.kotlin.ir.IrStatement
-import org.jetbrains.kotlin.ir.declarations.IrClass
-import org.jetbrains.kotlin.ir.declarations.IrFile
-import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
-
-class IrClassContext(val irClass: IrClass, val parent: IrClassContext?)
-
-abstract class ClassLowerWithContext : FileLoweringPass, IrElementTransformer<IrClassContext?> {
-
-    private val companion2Context = mapOf<ClassDescriptor, IrClassContext>()
-
-    private val irClass2Context = hashMapOf<IrClass, IrClassContext>()
-
-    override fun lower(irFile: IrFile) {
-        val packageIr = irFile.declarations.singleOrNull { it is IrClass && it.isFileClass } as? IrClass
-        if (packageIr != null) {
-            visitClass(packageIr, null)
-            irFile.declarations.filterNot { it == packageIr }.forEach { it.accept(this, irClass2Context[packageIr]!!) }
-        } else {
-            irFile.accept(this, null)
-        }
-    }
-
-    override fun visitClass(declaration: IrClass, data: IrClassContext?): IrStatement {
-        val context = IrClassContext(declaration, data)
-        irClass2Context.put(declaration, context)
-        lowerBefore(declaration, context)
-        val clazz = super.visitClass(declaration, context)
-        lower(declaration, context)
-        return clazz
-    }
-
-    open fun lowerBefore(irClass: IrClass, data: IrClassContext) {}
-
-    abstract fun lower(irCLass: IrClass, data: IrClassContext)
-
-    fun findCompanionFor(irClass: IrClass, descriptor: ClassDescriptor): IrClassContext {
-        val companion = companion2Context[descriptor] ?: throw RuntimeException("Can't find companion object for $irClass by $descriptor")
-        assert(irClass == companion.parent?.irClass) {"Wrong companion object: $irClass != ${companion.parent?.irClass}"}
-        return companion
-    }
-}