Helgrind optimisation: 
* do VTS pruning only if new threads were declared
  very dead since the last pruning round.
* When doing pruning, use the new list of threads very dead
  to do the pruning : this decreases the cost of the dichotomic search
  in VTS__substract



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15044 a5019735-40e9-0310-863c-91ae7b9d1cf9
1 file changed