Revert "Fix Binds being read from tasty as if they were type trees."

This reverts commit 30ec34f.

Author: nicolasstucki

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

@@ -436,8 +436,7 @@ object TastyFormat {
        | ANDtpt
        | ORtpt
        | BYNAMEtpt
-       | BIND => true // Dmitry: binds are "shared" as type trees would be shared, see https://github.com/lampepfl/dotty/pull/2510
-                      // But they are not type trees, as you can't have them inside TypeApply. See i2944a.scala
+       | BIND => true
     case _ => false
   }
 

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

@@ -1031,15 +1031,7 @@ class TreeUnpickler(reader: TastyReader, nameAtRef: NameRef => TermName, posUnpi
     }
 
     def readTpt()(implicit ctx: Context) =
-      if (isTypeTreeTag(nextUnsharedTag)) {
-        val isShared = nextByte == SHARED
-        val term = readTerm()
-        term match {
-          case a: DefTree if isShared =>
-            ref(a.namedType)
-          case _ => term
-        }
-      }
+      if (isTypeTreeTag(nextUnsharedTag)) readTerm()
       else {
         val start = currentAddr
         val tp = readType()

tests/pos/i2944.scala

@@ -3,6 +3,7 @@ trait Map2[K] {
   def foo: K = {
     this match {
       case that: Map2[b] => that.get(3.asInstanceOf[b])
+      //case that: Map2[c] => that.get(4.asInstanceOf[K])
       case _ => get(5.asInstanceOf[K])
     }
   }