[K/N] Remove old ToplevelPhases.kt

It contains only commented CheckSamSuperTypes phase which is disabled
for quite some time. If we ever need this lowering again it could be
found in this commit.

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ToplevelPhases.kt

@@ -1,40 +0,0 @@
-/*
- * 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.backend.konan
-
-
-/*
- * Sometimes psi2ir produces IR with non-trivial variance in super types of SAM conversions (this is a language design issue).
- * Earlier this was solved with just erasing all such variances but this might lead to some other hard to debug problems,
- * so after handling the majority of corner cases correctly in psi2ir it is safe to assume that such cases don't get here and
- * even if they do, then it's better to throw an error right away than to dig out weird crashes down the pipeline or even at runtime.
- * We explicitly check this, also fixing older klibs built with previous compiler versions by applying the same trick as before.
- */
-//internal val checkSamSuperTypesPhase = konanUnitPhase(
-//        op = {
-//            // Handling types in current module not recursively:
-//            // psi2ir can produce SAM conversions with variances in type arguments of type arguments.
-//            // See https://youtrack.jetbrains.com/issue/KT-49384.
-//            // So don't go deeper than top-level arguments to avoid the compiler emitting false-positive errors.
-//            // Lowerings can handle this.
-//            // Also such variances are allowed in the language for manual implementations of interfaces.
-//            irModule!!.files
-//                    .forEach { SamSuperTypesChecker(this, it, mode = SamSuperTypesChecker.Mode.THROW, recurse = false).run() }
-//            // TODO: This is temporary for handling klibs produced with earlier compiler versions.
-//            // Handling types in dependencies recursively, just to be extra safe: don't change something that works.
-//            irModules.values
-//                    .flatMap { it.files }
-//                    .forEach { SamSuperTypesChecker(this, it, mode = SamSuperTypesChecker.Mode.ERASE, recurse = true).run() }
-//        },
-//        name = "CheckSamSuperTypes",
-//        description = "Check SAM conversions super types"
-//)
-
-// The original comment around [checkSamSuperTypesPhase] still holds, but in order to be on par with JVM_IR
-// (which doesn't report error for these corner cases), we turn off the checker for now (the problem with variances
-// is workarounded in [FunctionReferenceLowering] by taking erasure of SAM conversion type).
-// Also see https://youtrack.jetbrains.com/issue/KT-50399 for more details.
-//        disable(checkSamSuperTypesPhase)