Move RABasic::addMBBLiveIns to the base class, it is generally useful.
Minor optimization to the use of IntervalMap iterators. They are fairly
heavyweight, so prefer SI.valid() over SI != end().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121217 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalUnion.h b/lib/CodeGen/LiveIntervalUnion.h
index 2068149..0c9a13a 100644
--- a/lib/CodeGen/LiveIntervalUnion.h
+++ b/lib/CodeGen/LiveIntervalUnion.h
@@ -75,6 +75,7 @@
// by their starting position.
SegmentIter begin() { return Segments.begin(); }
SegmentIter end() { return Segments.end(); }
+ bool empty() { return Segments.empty(); }
// Add a live virtual register to this union and merge its segments.
void unify(LiveInterval &VirtReg);