Properly unpickle TYPEREFin/TERMREFin

The member comes from a particular space but it has to be seen from the
current prefix to be valid. This is why compiling viewtest.scala from
TASTY stopped working two commits ago.

Author: smarter

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

@@ -251,17 +251,17 @@ class TreeUnpickler(reader: TastyReader,
               val space = readType()
               sname match {
                 case SignedName(name, sig) =>
-                  TermRef(prefix, name, space.decl(name).atSignature(sig))
+                  TermRef(prefix, name, space.decl(name).asSeenFrom(prefix).atSignature(sig))
                 case name =>
-                  TermRef(prefix, name, space.decl(name))
+                  TermRef(prefix, name, space.decl(name).asSeenFrom(prefix))
               }
             case TYPEREFin =>
               val name = readName().toTypeName
               val prefix = readType()
               val space = readType()
               space.decl(name) match {
                 case symd: SymDenotation if prefix.isArgPrefixOf(symd.symbol) => TypeRef(prefix, symd.symbol)
-                case _ => TypeRef(prefix, name, space.decl(name))
+                case _ => TypeRef(prefix, name, space.decl(name).asSeenFrom(prefix))
               }
             case REFINEDtype =>
               var name: Name = readName()

compiler/test/dotty/tools/dotc/FromTastyTests.scala

@@ -79,7 +79,6 @@ class FromTastyTests extends ParallelTesting {
 
          "t7223.scala",
          "t5428.scala",
-         "viewtest.scala",
 
          // Missing position
          "Course-2002-13.scala",