LiveIntervals: Add missing operator!= for segments

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@372449 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/LiveInterval.h

@@ -189,6 +189,10 @@ namespace llvm {
         return start == Other.start && end == Other.end;
       }
 
+      bool operator!=(const Segment &Other) const {
+        return !(*this == Other);
+      }
+
       void dump() const;
     };