[ADT] IntervalMap: fix setStart and setStop
Summary:
These functions currently require that the new closed interval has a length of
at least 2. They also currently permit empty half-open intervals. This patch
defines nonEmpty in each traits structure and uses it to correct the
implementations of setStart and setStop.
Reviewers: stoklund, chandlerc
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D26064
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@285957
91177308-0d34-0410-b5e6-
96231b3b80d8
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