Sort live intervals by increasing start point.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10289 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/LiveIntervalAnalysis.cpp

@@ -297,6 +297,7 @@ void LiveIntervals::computeIntervals()
         }
     }
 
+    std::sort(intervals_.begin(), intervals_.end(), StartPointComp());
     DEBUG(std::copy(intervals_.begin(), intervals_.end(),
                     std::ostream_iterator<Interval>(std::cerr, "\n")));
 }