[turbofan] LiveRange structure validation

src/compiler/register-allocator.h

Index: src/compiler/register-allocator.h
diff --git a/src/compiler/register-allocator.h b/src/compiler/register-allocator.h
index 38fad05ed327a171edc2a911badf5202b93433b8..d6ed0052704024939cdeb154b06210d62a8d7fa1 100644
--- a/src/compiler/register-allocator.h
+++ b/src/compiler/register-allocator.h
@@ -919,7 +919,12 @@ class LiveRangeBuilder final : public ZoneObject {
     return data()->live_in_sets();
   }
 
+  // Verification.
   void Verify() const;
+  bool IntervalStartsAtBlockBoundary(const UseInterval* interval) const;
+  bool IntervalPredecessorsCoveredByRange(const UseInterval* interval,
+                                          const TopLevelLiveRange* range) const;
+  bool NextIntervalStartsInDifferentBlocks(const UseInterval* interval) const;
 
   // Liveness analysis support.
   void AddInitialIntervals(const InstructionBlock* block, BitVector* live_out);