WIP fixing new LabelDefs with -optimise

Author: nicolasstucki

compiler/src/dotty/tools/dotc/transform/localopt/Simplify.scala

@@ -47,10 +47,10 @@ class Simplify extends MiniPhaseTransform with IdentityDenotTransformer {
     new InlineOptions               ::
     //new InlineLabelsCalledOnce    :: // not needed: new pattern matcher does this already
     new Valify(this)                ::
-    new Devalify                    ::
+//    new Devalify                    ::
     new Jumpjump                    ::
     new DropGoodCasts               ::
-    new DropNoEffects(this)         ::
+//    new DropNoEffects(this)         ::
     new InlineLocalObjects(this)    ::
     // new Varify                      :: // varify could stop other transformations from being applied. postponed.
     // new BubbleUpNothing             ::
@@ -63,7 +63,7 @@ class Simplify extends MiniPhaseTransform with IdentityDenotTransformer {
     new Devalify                    ::
     new Jumpjump                    ::
     new DropGoodCasts               ::
-    new DropNoEffects(this)         ::
+//    new DropNoEffects(this)         ::
     new ConstantFold(this)          ::
     Nil