[CFLAA] Remove tautological comparison

Fixes this (the warning is right, the unsigned value is not negative):
lib/Analysis/StratifiedSets.h:689:53: warning: comparison of unsigned expression >= 0 is always true [-Wtautological-compare]
  bool inbounds(StratifiedIndex N) const { return N >= 0 && N < Links.size(); }

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216987 91177308-0d34-0410-b5e6-96231b3b80d8