Fix rebase breakage around reporters.

Reporters are part of the context which is passed into a compiler run. Passing them
as a separate option is an unnecessary complication.

Author: odersky

src/dotty/tools/dotc/FromTasty.scala

@@ -42,7 +42,7 @@ object FromTasty extends Driver {
       List(new ReadTastyTreesFromClasses) :: backendPhases
     }
 
-    override def newRun(implicit ctx: Context, reporter: Option[Reporter] = None): Run = {
+    override def newRun(implicit ctx: Context): Run = {
       reset()
       new TASTYRun(this)(rootContext)
     }

test/dotty/partest/DPDirectCompiler.scala

@@ -23,9 +23,11 @@ class DPDirectCompiler(runner: DPTestRunner) extends nest.DirectCompiler(runner)
     }
 
     try {
-      val processor = if (opts0.exists(_.startsWith("#"))) dotty.tools.dotc.Bench else dotty.tools.dotc.Main
+      val processor =
+        if (opts0.exists(_.startsWith("#"))) dotty.tools.dotc.Bench else dotty.tools.dotc.Main
       val clogger = new ConsoleReporter(writer = clogWriter)(ctx)
-      val reporter = processor.process((sources.map(_.toString) ::: opts0).toArray, ctx, Some(clogger))
+      val logCtx = ctx.fresh.setTyperState(ctx.typerState.withReporter(clogger))
+      val reporter = processor.process((sources.map(_.toString) ::: opts0).toArray, logCtx)
       if (!reporter.hasErrors) runner.genPass()
       else {
         reporter.printSummary(ctx)