Deduplicate class names before starting compiling from TASTY

Author: nicolasstucki

compiler/src/dotty/tools/dotc/fromtasty/TASTYRun.scala

@@ -6,7 +6,7 @@ import core.Contexts._
 
 class TASTYRun(comp: Compiler, ictx: Context) extends Run(comp, ictx) {
   override def compile(classNames: List[String]) = {
-    val units = classNames.map(new TASTYCompilationUnit(_))
+    val units = classNames.distinct.map(new TASTYCompilationUnit(_))
     compileUnits(units)
   }
 }