Merge pull request #8815 from dotty-staging/fix-#8729

Fix #8729: Drop failing assertion in `enter`

Author: bishabosha

compiler/src/dotty/tools/dotc/core/SymDenotations.scala

@@ -1810,13 +1810,7 @@ object SymDenotations {
      */
     def enter(sym: Symbol, scope: Scope = EmptyScope)(implicit ctx: Context): Unit = {
       val mscope = scope match {
-        case scope: MutableScope =>
-          // if enter gets a scope as an argument,
-          // than this is a scope that will eventually become decls of this symbol.
-          // And this should only happen if this is first time the scope of symbol
-          // is computed, ie symbol yet has no future.
-          assert(this.nextInRun.validFor.code <= this.validFor.code)
-          scope
+        case scope: MutableScope => scope
         case _ => unforcedDecls.openForMutations
       }
       if (proceedWithEnter(sym, mscope)) {