LiveIntervalUpdate validators weren't recorded after the calls to...

LiveIntervalUpdate validators weren't recorded after the calls to std::for_each.  Turns out std::for_each doesn't update the variable passed in for the functor but instead copy constructs a new one.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155041 91177308-0d34-0410-b5e6-96231b3b80d8