Reapply "[PR16756] Use SSAUpdaterBulk in JumpThreading." one more time.

Hopefully, changing set to vector removes nondeterminism detected by
some bots, or the new assert will catch something.

This reverts commit r330180.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330403 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed