Remember the set of leaders.  Also compute on demand and cache the equiv
class for each leader.   Finally, rename Elem2ECLeaderMap to Elem2LeaderMap
(most of the changed lines are only due to the latter).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13651 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed