[ConstantRange] Add getNonEmpty() constructor
ConstantRanges have an annoying special case: If upper and lower are
the same, it can be either an empty or a full set. When constructing
constant ranges nearly always a full set is intended, but this still
requires an explicit check in many places.
This revision adds a getNonEmpty() constructor that disambiguates this
case: If upper and lower are the same, a full set is created.
Differential Revision: https://reviews.llvm.org/D60947
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358854
91177308-0d34-0410-b5e6-
96231b3b80d8
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