Remove QuoteUnpickler and use DottyUnpickler

Without the splices `QuoteUnpickler` is just a copy of the `DottyUnpickler`.

Author: nicolasstucki

compiler/src/dotty/tools/dotc/core/quoted/PickledQuotes.scala

@@ -13,6 +13,7 @@ import dotty.tools.dotc.core.Symbols._
 import dotty.tools.dotc.core.Types._
 import dotty.tools.dotc.core.tasty.TreePickler.Hole
 import dotty.tools.dotc.core.tasty.{ PositionPickler, TastyPickler, TastyPrinter }
+import dotty.tools.dotc.core.tasty.DottyUnpickler
 import dotty.tools.dotc.core.tasty.TreeUnpickler.UnpickleMode
 import dotty.tools.dotc.quoted.QuoteContext
 import dotty.tools.dotc.tastyreflect.{ReflectionImpl, TastyTreeExpr, TreeType}
@@ -191,7 +192,7 @@ object PickledQuotes {
     quotePickling.println(s"**** unpickling quote from TASTY\n${new TastyPrinter(bytes).printContents()}")
 
     val mode = if (isType) UnpickleMode.TypeTree else UnpickleMode.Term
-    val unpickler = new QuoteUnpickler(bytes, splices, mode)
+    val unpickler = new DottyUnpickler(bytes, mode)
     unpickler.enter(Set.empty)
 
     val tree = unpickler.tree

compiler/src/dotty/tools/dotc/core/quoted/QuoteUnpickler.scala

@@ -20,7 +20,7 @@ object DottyUnpickler {
   class TreeSectionUnpickler(posUnpickler: Option[PositionUnpickler], commentUnpickler: Option[CommentUnpickler])
   extends SectionUnpickler[TreeUnpickler](TreePickler.sectionName) {
     def unpickle(reader: TastyReader, nameAtRef: NameTable): TreeUnpickler =
-      new TreeUnpickler(reader, nameAtRef, posUnpickler, commentUnpickler, Seq.empty)
+      new TreeUnpickler(reader, nameAtRef, posUnpickler, commentUnpickler)
   }
 
   class PositionsSectionUnpickler extends SectionUnpickler[PositionUnpickler]("Positions") {

compiler/src/dotty/tools/dotc/core/tasty/DottyUnpickler.scala

@@ -47,13 +47,11 @@ import scala.annotation.internal.sharable
  *  @param reader              the reader from which to unpickle
  *  @param posUnpicklerOpt     the unpickler for positions, if it exists
  *  @param commentUnpicklerOpt the unpickler for comments, if it exists
- *  @param splices
  */
 class TreeUnpickler(reader: TastyReader,
                     nameAtRef: NameRef => TermName,
                     posUnpicklerOpt: Option[PositionUnpickler],
-                    commentUnpicklerOpt: Option[CommentUnpickler],
-                    splices: Seq[Any]) {
+                    commentUnpicklerOpt: Option[CommentUnpickler]) {
   import TreeUnpickler._
   import tpd._