Add base Mono phase

Author: mattisboeckle

effekt/shared/src/main/scala/effekt/core/Mono.scala

@@ -0,0 +1,15 @@
+package effekt
+package core
+
+import effekt.context.Context
+import effekt.lexer.TokenKind
+
+object Mono extends Phase[CoreTransformed, CoreTransformed] {
+
+  override val phaseName: String = "mono"
+
+  override def run(input: CoreTransformed)(using Context): Option[CoreTransformed] = {
+    Some(input)
+  }
+
+}

effekt/shared/src/main/scala/effekt/generator/llvm/LLVM.scala

@@ -54,7 +54,7 @@ class LLVM extends Compiler[String] {
   // -----------------------------------
   object steps {
     // intermediate steps for VSCode
-    val afterCore = allToCore(Core) andThen Aggregate andThen core.DeadCodeElimination andThen optimizer.Optimizer andThen core.PolymorphismBoxing
+    val afterCore = allToCore(Core) andThen Aggregate andThen core.DeadCodeElimination andThen core.Mono andThen optimizer.Optimizer
     val afterMachine = afterCore andThen Machine map { case (mod, main, prog) => prog }
     val afterLLVM = afterMachine map {
       case machine.Program(decls, defns, entry) =>