bubbleUpNothing: do we want it? It breaks the last 4 failing tests

Author: OlivierBlanvillain

compiler/src/dotty/tools/dotc/Compiler.scala

@@ -88,10 +88,10 @@ class Compiler {
            new NonLocalReturns,     // Expand non-local returns
            new CapturedVars,        // Represent vars captured by closures as heap objects
            new Constructors,        // Collect initialization code in primary constructors
-                                   // Note: constructors changes decls in transformTemplate, no InfoTransformers should be added after it
+                                    // Note: constructors changes decls in transformTemplate, no InfoTransformers should be added after it
            new FunctionalInterfaces, // Rewrites closures to implement @specialized types of Functions.
-           new GetClass,             // Rewrites getClass calls on primitive types.
-           new Simplify),            // Perform local optimizations, simplified versions of what linker does.
+           new GetClass,            // Rewrites getClass calls on primitive types.
+           new Simplify),           // Perform local optimizations, simplified versions of what linker does.
       List(new LambdaLift,          // Lifts out nested functions to class scope, storing free variables in environments
                                        // Note: in this mini-phase block scopes are incorrect. No phases that rely on scopes should be here
            new ElimStaticThis,      // Replace `this` references to static objects by global identifiers

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

@@ -150,10 +150,12 @@ class Simplify extends MiniPhaseTransform with IdentityDenotTransformer {
     dropNoEffects               ::
     // inlineLocalObjects          :: // followCases needs to be fixed, see ./tests/pos/rbtree.scala
     // varify                      :: // varify could stop other transformations from being applied. postponed.
-    bubbleUpNothing             ::
+    // bubbleUpNothing             ::
       // Still need to import the tailRec thing
       // t2429.scala
       // constraining-lub.scala
+      // t8933c.scala
+      // t348plus.scala
     constantFold                ::
     Nil