[JS IR BE] remove unnecesary code from DCE

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/Dce.kt

@@ -205,9 +205,6 @@ fun usefulDeclarations(roots: Iterable<IrDeclaration>, context: JsIrBackendConte
         while (queue.isNotEmpty()) {
             val declaration = queue.pollFirst()
 
-            // TODO remove?
-            stageController.lazyLower(declaration)
-
             fun IrDeclaration.enqueue(description: String, isContagious: Boolean = true) {
                 enqueue(declaration, description, isContagious)
             }
@@ -217,15 +214,6 @@ fun usefulDeclarations(roots: Iterable<IrDeclaration>, context: JsIrBackendConte
                     (it.classifierOrNull as? IrClassSymbol)?.owner?.enqueue("superTypes")
                 }
 
-                // TODO find out how `doResume` gets removed
-                if (declaration.symbol == context.ir.symbols.coroutineImpl) {
-                    declaration.declarations.toList().forEach {
-                        if (it is IrSimpleFunction && it.name.asString() == "doResume") {
-                            it.enqueue("hack for CoroutineImpl::doResume")
-                        }
-                    }
-                }
-
                 declaration.annotations.forEach {
                     val annotationClass = it.symbol.owner.constructedClass
                     if (annotationClass.isAssociatedObjectAnnotatedAnnotation) {
@@ -254,9 +242,6 @@ fun usefulDeclarations(roots: Iterable<IrDeclaration>, context: JsIrBackendConte
                 else -> null
             }
 
-            // TODO remove?
-            (body as? IrBody)?.let { stageController.lazyLower(it) }
-
             body?.acceptVoid(object : IrElementVisitorVoid {
                 override fun visitElement(element: IrElement) {
                     element.acceptChildrenVoid(this)