Revert r283057 and r283058

They've broken the sanitizer-bootstrap bots.  Reverting while I investigate.

Original commit messages:

r283057: "[ConstantRange] Make getEquivalentICmp smarter"

r283058: "[SCEV] Rely on ConstantRange instead of custom logic; NFCI"

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283062 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed