Don't keep full picklers around until backend.

The memory footprint captured by pickler seems to be about
1/3rd of total footprint. So we gain a lot by not making this
die sooner rather than later.

1 files changed, 2 insertions, 6 deletions

diff --git a/src/dotty/tools/dotc/CompilationUnit.scala b/src/dotty/tools/dotc/CompilationUnit.scala
index 16a59250b..491c2bd9b 100644
--- a/src/dotty/tools/dotc/CompilationUnit.scala
+++ b/src/dotty/tools/dotc/CompilationUnit.scala
@@ -17,12 +17,8 @@ class CompilationUnit(val source: SourceFile) {
 
   def isJava = source.file.name.endsWith(".java")
 
-  /**
-   * Picklers used to create TASTY sections, indexed by toplevel class to which they belong.
-   * Sections: Header, ASTs and Positions are populated by `pickler` phase.
-   * Subsequent phases can add new sections.
-   */
-  var picklers: Map[ClassSymbol, TastyPickler] = Map()
+  /** Pickled TASTY binaries, indexed by class. */
+  var pickled: Map[ClassSymbol, Array[Byte]] = Map()
 
   var unpicklers: Map[ClassSymbol, TastyUnpickler] = Map()
 }