Revert two SCEV changes that caused test failures in clang.

r248606: "[SCEV] Exploit A < B => (A+K) < (B+K) when possible"
r248608: "[SCEV] Teach isLoopBackedgeGuardedByCond to exploit trip counts."

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248614 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed