SI-5767 fix + small HashSet/HashMap fixes

- `LinkedHashSet` implementation moved from `FlatHashTable` to `HashTable`
   - `remove` time reduced from O(n) to O(1)
   - `diff` time reduced from O(n^2) to O(n)
- A bit of refactoring in `HashTable` serialization code
- Putting an element into hash map now avoids double hash code/hash index
  calculation (see `HashTable#findOrAddEntry`)
- bugfix: compiler/LambdaLift occasionally breaks LinkedHashSet integrity

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compiler/scala/tools/nsc/transform/LambdaLift.scala b/src/compiler/scala/tools/nsc/transform/LambdaLift.scala
index b6d54f114e..c41ff20229 100644
--- a/src/compiler/scala/tools/nsc/transform/LambdaLift.scala
+++ b/src/compiler/scala/tools/nsc/transform/LambdaLift.scala
@@ -154,7 +154,7 @@ abstract class LambdaLift extends InfoTransform {
     private def markCalled(sym: Symbol, owner: Symbol) {
       debuglog("mark called: " + sym + " of " + sym.owner + " is called by " + owner)
       symSet(called, owner) addEntry sym
-      if (sym.enclClass != owner.enclClass) calledFromInner addEntry sym
+      if (sym.enclClass != owner.enclClass) calledFromInner += sym
     }
 
     /** The traverse function */