[IndVarSimplify] Ignore unreachable users of truncs

If a trunc has a user in a block which is not reachable from entry,
we can safely perform trunc elimination as if this user didn't exist.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335816 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed