Simplify SymDenotations.originalOwner.

Author: sjrd

compiler/src/dotty/tools/backend/jvm/DottyBackendInterface.scala

@@ -760,10 +760,6 @@ class DottyBackendInterface(outputDirectory: AbstractFile, val superCallsMap: Ma
       // used to populate the EnclosingMethod attribute.
       // it is very tricky in presence of classes(and annonymous classes) defined inside supper calls.
       if (sym.exists) {
-        /* This logic is similar to SymDenotations.originalOwner, but it cannot
-         * easily be factored out because we need the `shiftedContext` when calling
-         * `lexicallyEnclosingClass`.
-         */
         val validity = toDenot(sym).initial.validFor
         val shiftedContext = ctx.withPhase(validity.phaseId)
         toDenot(sym)(shiftedContext).lexicallyEnclosingClass(shiftedContext)

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

@@ -400,13 +400,7 @@ object SymDenotations {
     final def originalName(implicit ctx: Context): Name = initial.effectiveName
 
     /** The owner with which the denoting symbol was created. */
-    final def originalOwner(implicit ctx: Context): Symbol =
-      if (exists) {
-        // There is a similar logic in DottyBackendInterface.originalLexicallyEnclosingClass (see comment there)
-        val validity = initial.validFor
-        val shiftedContext = ctx.withPhase(validity.phaseId)
-        Symbols.toDenot(symbol)(shiftedContext).maybeOwner
-      } else NoSymbol
+    final def originalOwner(implicit ctx: Context): Symbol = initial.maybeOwner
 
     /** The encoded full path name of this denotation, where outer names and inner names
      *  are separated by `separator` strings as indicated by the given name kind.