Revert accidentally committed files

Author: odersky

compiler/src/dotty/tools/dotc/config/Config.scala

@@ -160,7 +160,7 @@ object Config {
   final val showCompletions = false
 
   /** If set, enables tracing */
-  final val tracingEnabled = true
+  final val tracingEnabled = false
 
   /** Initial capacity of uniques HashMap.
    *  Note: This MUST BE a power of two to work with util.HashSet

compiler/src/dotty/tools/dotc/core/classfile/ClassfileParser.scala

@@ -761,7 +761,7 @@ class ClassfileParser(
           assert(cond,
             s"Unpickling ${classRoot.symbol.showLocated} from ${classRoot.symbol.associatedFile} is not allowed with -Yscala2-unpickler $allowed")
 
-        if (false && allowed != "always") {
+        if (allowed != "always") {
           failUnless(allowed != "never")
           val allowedList = allowed.split(":").toList
           val file = classRoot.symbol.associatedFile