WIP better data structures/algorithms for classpath merging

Author: retronym

src/compiler/scala/tools/nsc/classpath/AggregateClassPath.scala

@@ -111,7 +111,7 @@ case class AggregateClassPath(aggregates: Seq[ClassPath]) extends ClassPath {
   private def mergeClassesAndSources(entries: Seq[ClassRepresentation]): Seq[ClassRepresentation] = {
     var count = 0
     val indices = collection.mutable.HashMap[String, Int]()
-    val mergedEntries = new ArrayBuffer[ClassRepresentation](1024)
+    val mergedEntries = new ArrayBuffer[ClassRepresentation](entries.size)
 
     for {
       entry <- entries