Eliminate allocations in Types.

At this commit the statistics when compiling src/library
are as follows. These counts are precise, collected by a
modified Function1 which counts every instantiation of every
implementing class. The net result is 27 million fewer
allocations, over a 20% drop.

  // master (5b5635ee9d), total and top five by count:
  Total Function1 allocations: 128,805,865

  scala.collection.immutable.$colon$colon 26781958
  scala.collection.mutable.ListBuffer 15365174
  scala.collection.TraversableLike$$anonfun$map$1 9127787
  scala.collection.generic.Growable$$anonfun$$plus$plus$eq$1 4636154
  scala.collection.mutable.StringBuilder 3531211

  // After these commits, total and top five by count:
  Total Function1 allocations: 101,865,721

  scala.collection.immutable.$colon$colon 26993704
  scala.collection.mutable.ListBuffer 15319656
  scala.collection.TraversableLike$$anonfun$map$1 7585019
  scala.reflect.internal.Types$MethodType$$anonfun$paramTypes$1 2447307
  scala.reflect.internal.Types$SubstSymMap 2436088

0 files changed, 0 insertions, 0 deletions