Summary:
This allows sharing the lattice value code between LVI and SCCP (D36656).
It also adds a `satisfiesPredicate` function, used by D36656.
Reviewers: davide, sanjoy, efriedma
Reviewed By: sanjoy
Subscribers: mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D37591
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314411 91177308-0d34-0410-b5e6-96231b3b80d8
